The girl to win? (3)

I believe the answer is:

bet

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

'the girl' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for bet that I've seen before include "Wager, speculate" , "Wager, gamble" , "Wager, or the sum waged" , "Wager, back" , "Money risked on a gamble" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app