Thank you! They make sense when you have the answers, but I am really not very good at understanding the clues, hopefully with some practice I will start to be able to do most of them myself :)
17. Explosive hazard at high pressure where Brunel can be found. (8)
18. Keeps relative in a large unit in Somerset. (7)
19. Can the helm be broken at the races? (10)
20. Map caption for crossing by one of three choirs. (8)
21. Cockney wild fruits and broom owner heard in the East. (7)
22. Ruby racecourse. (7)
23. Point nail out before premiere of Grand Comedy. (6)
24. Eliot’s weaver returns to hide plain city. (9)
25. Point very quietly in the primeval Germanic Forest. (6)