Crossword Genius

One making war for a bet? (5)

Ross

I believe the answer is:

wager

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

I've seen this clue in the Evening Standard.
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