Hazel's bet, reduced by uncertainty, withdrawn (7)
I believe the answer is:
filbert
'hazel's' is the definition.
(filbert is a kind of hazel)
'bet reduced by uncertainty withdrawn' is the wordplay.
I cannot really see how this works, but
'uncertainty' could be 'er' (somebody might say 'er' if uncertain) and 'er' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for filbert that I've seen before include "Type of hazelnut" , "Nut -- left rib (anag)" , "Hazel nut" .)