A boy beater? (7)
I believe the answer is:
drummer
'beater?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'a boy' is the wordplay.
I cannot quite understand how this works, but
'boy' could be 'dru' and 'dru' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for drummer that I've seen before include "Traveller in America" , "salesman to America" , "One using sticks" , "Group member" , "Rich, say" .)