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20 a. Member's exterior is terribly neat and stylish (7)
17d. Dangerous substance thrown at bosses (8)
14d. Defence group, noncommittal and vulnerable (9)
25a. Part of a degree (5)
Any help available...Thanks in advance..

20a) elegant (leg+neat)

14d) unguarded

17 asbestos - anag of at bosses

Last one might be "grade" but not sure.

Thank you andyc and chrisg...last one turned out to be 'third'...