Does he go _pop-pop”? (4)
I believe the answer is:
papa
'does he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'pop-pop?' is the wordplay.
'pop' becomes 'pa' (both can mean father).
'pop?' becomes 'pa' (both can mean father).
'pa'+'pa'='PAPA'
'go' is the link.
Can you help me to learn more?
(Other definitions for papa that I've seen before include "Mama's other half?" , "Comms code for 'P'" , "Father; letter P" , "Dad" , "The old man" .)