Solution to 6D has been deliberately left unsolved and is to be answered by a non-regular/novice commenter, with proper annotation. Those who have answered earlier in the week, please give others a chance.
Open for anyone to answer, if not solved by 1 PM.
ACROSS
7 Bill while cycling takes in extremely coquettish style of dancing (6) TECHNO {(-no)TE(+n)NO} over {Co...sH}
8 On and off friend's watching volatile jamboree (8) FESTIVAL {FriEndS+waTchIng+VolAtiLe}
9 Complacent auditor conceals part of a bloomer (8) PLACENTA [T]
10 Oral consent to rise (6) ASCENT (~assent)
11 Send journalist back with second reinforcement (8) DESPATCH {ED<=}{S}{PATCH}
12 Stupid and pointless without basic strategy (6) INSANE {IN{St...y}ANE}
13 A pet's craft requirement (7,4) MASKING TAPE {A+PET}* [RA]
20 Climax surrounding essentially stunning party for the soon-to- be union member (3,5) HEN NIGHT {HE{stuNNing}IGHT}
22 Challenge accountant raising fee (6) ACCOST {CA<=}{COST}
23 Bananas ripen over and over again to get this pungent compound (8) PIPERINE* Letterbank
24 Watched one going crazy about poetry (8) OVERSEEN {O{VERSE}EN*}
25 Reddish-yellow stain covers corner (6) RUSSET {RUS{SE}T
DOWN
1 Firmly established like a frog? (4-3) WELL-SET [DD]
2 Legume croquettes, halibut in curried kimchi, pineapple enchiladas & avocado for starters (8) CHICKPEA Acrostic
4 Surprisingly it's easy to film Spain's top writer (8) ESSAYIST {ITS+EASY}* over {Sp..n}
5 Tailless sick cur exploited! Is it fair? (6) CIRCUS {SICk+CUR}*
6 Notice fly hovering around a nurse (7) ?A?N?N?
8 Spooner's gurgling in the cooler is short- lived? (5,2,3,3) FLASH IN THE PAN (plash in the fan to flash in the pan)
14 Barking kitten or is it more complicated? (8) KNOTTIER* What's the role of 'is it'?
17 Clap to a large extent with understanding (7) THUNDER [T]
19 In a foreign land, rook moves behind on a ship (6) ABOARD AB(-r)OA(+r)RD
21 New copy line for household linen (6) NAPERY {N}{APE}{RY}
Reference List
Journalist = ED, Second = S, Corner = SE(South East), Rook = R, New = N, Copy = APE, Line = RY(Railway)



