Contribution in strike (5)
I believe the answer is:
whack
This might be a double definition.
'contribution' is the first definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps you can see a link between them that I don't see?
'strike' is the second definition.
(thesaurus)
'in' is the link.
Can you help me to learn more?
(Other definitions for whack that I've seen before include "Strike sharply" , "Punch" , "Hit loudly" , "ration" , "Strike; specified share" .)