Across:
1 To cross Swords (to cross swords/argue = BICKER), motorcyclist (BI-KER) went over 100 (-C-) (BICKER),
4 Fences off (ISOLATES) aisles to (aisles to = ISOLATES) building (= anagram indicator),
9 Gives one’s address (ORATES), content to offset a roadblock (content to ‘offset a roadblock’ = set a ro) going all the way back (= reversal indicator) (setaro = ORATES),
10 Expression (TERM-) in (-IN-) Alabama (-AL) (TERMINAL) when there’s no way back (TERMINAL),
12 Popular type (trendy = -HIP) behind (= positional indicator) bar rooms (COURTS-) (COURTSHIP) – a labour of love perhaps (COURTSHIP),
13 Pole (North Pole = N-) only (only = -YLON) makes a mess (= anagram indicator) (NYLON) of material (NYLON),
14 Thought (‘thought’ = ‘taught’ = EDUCATED) out loud (= homophone indicator) following (= positional indicator) those opening 18 across (opening ‘self-employed = SELF-) (SELF - EDUCATED) and learnt one’s own lessons, of course (SELF-EDUCATED),
18 Has a job working alone (SELF-EMPLOYED) in Labour – for one, not being part of the general staff (SELF-EMPLOYED),
21 Pull (CLOUT) copyright (C-) for Yahoo (yahoo/thug = -LOUT) (CLOUT),
22 Reading (R-) issue (edition = -E-DITION) about new (-N-) (RENDITION) performance (RENDITION),
24 Most of the (p) downturn (most of the ‘dip’ = DI-) relates to beastly types (-SABLES) (DISABLES) of sabotages (DISABLES),
25 Car (Model T-) for travelling (= anagram indicator) Haiti (Haiti = -AHITI) (TAHITI) – an old French colony (TAHITI is an old French colony),
26 Ridicule (CONTEMPT) criminal (CON-) and part-time worker (-TEMP-) starting trouble (starting ‘trouble’ = -T) (CONTEMPT),
27 Criminal (= anagram indicator) rents (rents = SENTR-) yard (-Y) (SENTRY) from guard (SENTRY).
Down:
1 Cabinet (BOOKCASE) order (BOOK-) comes in front of the judge (-CASE) (BOOKCASE),
2 It’s a habit (CHASUBLE) to almost (e) run after (‘chase’ without ‘e’ = CHAS-) blue (blue = -UBLE) bottle? (= anagram indicator) (CHASUBLE),
3 Closing the surveillance (closing the ‘surveillance’ = E-) outlet (-VENT) (EVENT) is a news item (EVENT),
5 What the Good Shepherd is doing (SHEEP FARMING) looking after his flock (SHEEP FARMING),
6 Zest (LEMON PEEL) of Frenchman (Monsieur = -M-) in Lyon (‘Lyon’ = ‘Leon’ = LE-ON) told (= homophone indicator) to strip (PEEL) (LEMON PEEL),
7 Twist (TANGLE) for drunk (= anagram indicator) agent (agent = TANG-E) consuming port (port/left = -L-) (TANGLE),
8 Panellist misses pal (‘panellist’ misses ‘pal’ = enlist = SILENT) still (SILENT),
11 Scream (SHOUT FOR HELP) from Bellow (bellow = SHOUT) – where has Lassie gone? (FOR HELP) (SHOUT FOR HELP),
15 Trimmed (cut each side: ‘s+t’) select (“select’ without ‘s+t’ = ELEC-) piece of furniture (-TABLE) (ELECTABLE) to make the minimum quota for office? (ELECTABLE),
16 Reading (-R-) in Sicily (Sicily = LY-ICIS-), novel (= anagram indicator) by tenor- (-T) (LYRICIST) -songwriter (LYRICIST),
17 One (I-) gets to say it ain’t true (deny = -DEN-Y) about bird (-TIT-) (IDENTITY) with personality (IDENTITY),
19 Sharp (ACIDIC) middleman (middle ‘man’ = A-) contacts police department (-CID-) in middle of homicide (in middle of ‘homicide’ = -IC) (ACIDIC),
20 In relation (COUSIN) to documentaries dismissing red meat? (‘documentaries’ dismissing ‘red meat’ = ocunis = COUSIN),
23 It’s pointless (INANE) with characters embraced within a network (characters embraced ‘within a network’ = INANE).