Share defeat (5)
I believe the answer is:
whack
This clue could be a double definition.
'share' is the first definition.
(whack can mean a share or contribution)
'defeat' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
Can you help me to learn more?
(Other definitions for whack that I've seen before include "Punch" , "Strike hard" , "Hard hit" , "Resounding blow" , "Strike sharply" .)