Message for Mark re his queries and some possible further clues:
Re 3 D: A-O-- The reference to 25 in the clue is to 25 down not 25 across - took me a bit to realise that - it's where it might live.
Re 14 A: I-E / --E First word is one which is ofeten used in crosswords for diamonds, second word as it says is one of 16's weapons but it was often known by a different name.
Re 15 D: --O-S Think drums regarding 16.
Re 29 A: F-L-T- Anagram of 26 + e.
Re 11a I have an answer that I'm not sure about so I'll let someone else come back to you on that one.
Good luck