Fine bet made to a sportsman's advantage (7)
I believe the answer is:
benefit
'sportsman's advantage' is the definition.
'benefit' can be an answer for 'advantage' (I've seen this before). I am not sure about the 'sportsman's' bit.
'fine bet made' is the wordplay.
'made' is an anagram indicator.
'fine'+'bet'='finebet'
'finebet' anagrammed gives 'BENEFIT'.
'to a' is the link.
Can you help me to learn more?
(Other definitions for benefit that I've seen before include "Fine bet on to produce an advantage" , "Advantage; dole" , "(Gain) advantage" , "Performance for charity" , "allowance" .)