Across:
1 Some Tennessean celebrity (some ‘tennesSEAN CElebrity’ = seance = SEANCE) sits at a table calling for spirits (SEANCE),
4 Gets rid of (OFFLOADS) old French (Old French = OF-) force (-F-) with chaps (lads = L-ADS) over nothing (-O-) (OFFLOADS),
9 Standard (NORMAL) cote outside of Monte Carlo (‘cote’ outside of ‘Monte Carlo’ = monarl = NORMAL),
10 College (D-CU-) houses old (-O-) workers (-MEN-) with tonne (-T) (DOCUMENT) of paper (DOCUMENT),
12 Of little value (WORTHLESS) to women (W-) laying out (= anagram indicator) hostels (hostels = -O-THLESS) overlooking river (-R-) (WORTHLESS),
13 Share out missing art (‘share out’ missing ‘art’ = sheou = HOUSE) and put up (HOUSE),
14 Guide (COACH-) for a person on site (-BUILDER) (COACHBUILDER) working in the travel business (COACHBUILDER),
18 Positions taken by managers (COACHING JOBS) in distress (aching = -ACHING) with Juliet (J-) Ring (-O-) caught in female types of pens (male swans) female swans = cobs = CO- -BS) (COACHING JOBS),
21 Island in The Atlantic (Iona = -ANOI) close to Savannah (close/end to ‘savannaH’ = H-) going all the way back (= reverse all indicator) (HANOI) is home to millions of Asians (HANOI capital of Vietnam),
22 A real open (a real open) question (= anagram indicator) (a real open = AEROPLANE) for highflyer (AEROPLANE),
24 To the gate, it’s sensational (to The Gate Theatre it’s DRAMATIC) striking (DRAMATIC),
25 Awful (= anagram indicator) traits (traits = ARTIST) of one creating a scene (ARTIST),
26 Covering up (DRESSING) for outfit (DRESS-) in (-IN-) Government (-G) (DRESSING),
27 Barman (BL-) at closing time (-END-) opening some (opening ‘Some’ = -S) (BLENDS) types of whiskies (BLENDS).
Down:
1 Something for lunch (SANDWICH) on the beach (SAND-) with a fair amount of (half of) wine (half of ‘WIne’ = -WI-) that’s cold (-C-) on top of the hamper (on top of the ‘Hamper’ = -H) (SANDWICH),
2 Article (A-N) about love in Ireland (Irish ‘love’ = ‘grá’ = -GRA-) for academy (Royal Irish Academy = -RIA-) (AGRARIAN) with an agricultural bent (AGRARIAN),
3 Vehicle (COACH) is a first-class alternative (COACH is an alternative to first class on a plane/train),
5 The spear carriers (FOOT SOLDIERS) on the hoof hired by a company (FOOT SOLDIERS)
6 Drug he (drug he) manufactured (= anagram indicator) (drug he = -UGH DER-) in part of the wooden cabin (log = LO- -G) (LOUGH DERG) by lake (LOUGH DERG),
7 A (A-) scene (scene/place = -VENUE) (AVENUE) out of The Road (AVENUE),
8 Material (SATEEN) for a tense (a tense) adaptation (= anagram indicator) (a tense = SATEEN),
11 Sister (-NUN-) spies (-CIA-) on the innocent ones, for starters (‘The Innocent Ones’ for starters = -TIO-), in foxhole (den = DE-N) (DENUNCIATION) producing strong public criticism (DENUNCIATION),
15 Those causing trouble (HOOLIGANS) all turned up (= reverse all indicator) – an unexpected problem (snag = -GANS) for single (-I-) gents (loo = -OOL-) having second thoughts (second ‘tHoughts’ = -H) (HOOLIGANS),
16 Liquid applied to skin (lotion = LO-TION) includes actinium (Ac) bringing up (= reverse indicator) (Ac = -CA-) (LOCATION) one of the spots? (spot = LOCATION),
17 Lincoln (Abe Lincoln = A-BE-) admitting bender (-S- bend) with drunks (sots) knocking back (= reverse indicator) (sots = -STOS) (ASBESTOS) a mineral laced with harmful stuff (ASBESTOS),
19 A (-A-) key (music key -D-) found in outhouse (shed = SH-ED) (SHADED) under the tree (SHADED),
20 Inadvisable to remove basil (‘inadvisable’ to remove ‘basil’ = inadve = INVADE) or move into other parts of the plot (INVADE),
23 The risk (PERIL) of spinning (= reverse indicator) record (long playing record = LP = P-L) about Ireland (IRE = -ERI-) (PERIL).