1: OJ rants about USC football players (7)

4: Tamer starting to bother pilot, ultimately? (7)

8: Resolute British detectives in action (7)

10: Any environment for car maintenance (7)

11: Work out how first Spanish olive was pitted. (5)

12: Drongo lacks even a pet (3)

13: Neil lost a letter and ended up with nothing (3)

14: Just grazed the pasty? (4-7)

16: He wrote a bit of poetry! (3)

17: Capture ten heading north (3)

18: Exegesis of clue an idiot misunderstood (11)

19: Number One in facetiousness (3)

21: Five kills one. (3)

22: Nothing, nothing in shape (5)

24: Song takes jibe at Chicago newspaper (7)

25: Reduces strain from years of tension (7)

26: Errant son taking coin without permission (7)

27: Fools around near hellholes (7)

1: Small change comes back as recurring fluctuations (5)

2: Believer in esoteric powers is joining quasi-religious group in October (9)

3: Recipient of drink describing gown with energy (9)

4: Brando rinsing out identification tools (8,5)

5: Getting old drink in silver container (5)

6: Oddly, derros wont die in water! (5)

7: Uncommon fly on rare plant (5,4)

9: Defusing timer incorrectly can lead to this! (13)

14: Incredible disorder in fat cats (9)

15: Certain flyer's canteen empty, per Reverend Spooner (9)

16: Confounded Erin's pros and cons (9)

20: Pervert stripped in mineral water (5)

21: Entertain one of nine daughters of Mnemosyne (5)

23: Sprinkles studs under reconstruction (5)