Across:
8 Producers (CAUSES) of fishy (= anagram indicator) sauces (sauces = CAUSES),
9 Better half (HELPMATE) of 24 across (HELP-) and 10 across (-MATE) (HELPMATE),
10 Fragment of dogma technically (fragment of ‘dogma technically’ = MATE), derived from partner (MATE),
11 Croatian (Croatian = A-RACTION) production (= anagram indicator) covering race (-TT- race) (ATTRACTION) draw (ATTRACTION),
12 In the main, Israelis (JEW-S) embraced The Foreign (Spanish ‘the’ = -EL-) (JEWELS) Stones (JEWELS),
14 Protect the last line of defence (KEEP GOAL) for castle (KEEP) with The Holy Grail (GOAL) (KEEP GOAL),
15 Doing your bit (HELPING THE CAUSE) for 24 across (‘help’ = HELP-) in (-IN-) Government (-G) – it’s what the rebel will appreciate (THE CAUSE) (HELPING THE CAUSE),
18 Credit (-CR-) English (-E-) group (SE-T-) outside large (-L-) yard (-Y) (SECRETLY) behind closed doors (SECRETLY),
20 Julius Caesar got rid of juries (‘Julius Caesar’ got rid of ‘juries’ = luscaa = CASUAL) – how flippant is that? (CASUAL),
22 Latest lies (latest lies = SATELLITES) produced by (= anagram indicator) those overseeing The Globe (those overseeing the globe/the world = SATELLITES),
24 The option to cure (HELP) – will that save someone’s bacon? (HELP),
25 Trick (CON-) on Greek island (-CRETE) (CONCRETE) for securing the property (CONCRETE),
26 Made a profit (NETTED) clearing prams out of departments (clearing ‘prams’ out of ‘departments’ = detent = NETTED).
Down:
1 Parents (Da + Ma = DAMA-), for example (e.g. = -GE), upset (= reversal indicator) (DAMAGE) by vandalism (DAMAGE),
2 Desperate (= anagram indicator) lies (lies = ISLE) identified by those on board (ISLE),
3 Couple of beastly figures (ass + ass = ASSASS-) up (= reversal indicator) north (NI = -IN) (ASSASSIN) capable of getting away with murder (ASSASSIN),
4 Characters with no carers (‘characters’ with no ‘carers’ = hact = CHAT) or that’s the gossip (CHAT),
5 Most of (k) fire (‘sack’ without ‘k’ = -SAC-) in drink (AL-E) (ALSACE) from French region (ALSACE),
6 Milk (EMPTY) from the bottle (GLASS) (EMPTY GLASS) requires a top up (EMPTY GLASS),
7 German (OTTO-) chap (-MAN-) with the last of the clowns’ (the last of the ‘clowns’ = -S) (OTTOMANS) parlour pieces (OTTOMANS),
13 Go through (EXPERIENCE) one’s history in Labour (one’s work EXPERIENCE),
14 Fund (KITTY) for type of gear (KIT-) you’d find in a fair amount of (half of) the city (half of ‘city’ = -TY) (KITTY),
16 It’s the type of music (ELEVATOR music) that has its ups and downs (ELEVATOR),
17 Forgiving (EXCUSING) deranged (= anagram indicator) genius (genius = E-USING) holding wrong (-X-) key (music key -C-) (EXCUSING),
19 Opened up about (TALKED) something similar to 4 down (TALK- similar to ‘chat’) with journalist (-ED) (TALKED),
21 Confederates (ALLIES) of gangster (AL- Capone) generally arrive in a pack (‘pack of lies’ = -LIES) (ALLIES),
23 Teachers have no cash (‘teachers’ have no ‘cash’ = teer = TREE) for the children’s playhouse (TREE),
24 This (this = HITS) problem (= anagram indicator) with strikes (strikes = HITS).