One making war for a bet? (5)
I believe the answer is:
wager
'a bet?' is the definition.
('wager' can be a synonym of 'bet')
'one making war' is the wordplay.
I cannot really see how this works, but
'one' could be 'er' (I've seen this in other clues) and 'er' is located in the answer.
The remaining letters 'wag' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for wager that I've seen before include "stake required" , "A bet or stake" , "Put on a bit" , "(Place a) stake" , "One making pledge" .)