Who benefits from one visiting inexperienced youngster on round? (3,4)
I believe the answer is:
cui bono
'who' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see an association between them that I can't see?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cui bono that I've seen before include "Who benefits?" , "Who gets any benefit from" , "who gains?" .)