answers are all fabrics/clothing materials

[nurse1967]

4. Got by flogging hamburgers (7)
10. wears well although defeated (7)
17. will it go off with a bang ? (7)
18. make advances to fifty, perhaps (4)....... the answer to clue 50 is flannel

[shaneystar]

17.Bombace... a type of cotton padding.

[kosoro]

 18..I Can only think of FACE but is that a fabric?????

[shaneystar]

Well that would make sense to tie up with flannel..as in face flannel.

[shaneystar]

Or it could be ..Felt

[shaneystar]

10. Could be Worsted ...a hard wearing woollen material.
Worsted is also an archaic word meaning defeated.

http://dictionary.reference.com/search?q=worsted

[shaneystar]

4. After much thought ..... Cowhide.

[juliefer]

18. Could be WOOL - woo for 'make advances' and L for 'fifty'.

[shaneystar]

Of course!! I think you are right there Julie.
There's a whole list of these further down which kept me awake last night.

[nurse1967]

you lot are so clever.... many thanks. Just no.17 to go

[shaneystar]

17 Must be Bombace. A Bomb goes off with a bang.
There is a fabric called Bustian as well.

[nurse1967]

I've decided that the answer to no. 17 is.....ticking

[shaneystar]

Of course! .It's so obvious!!...Good luck with your quiz.