Does he make staging? (8)
I believe the answer is:
producer
'does he' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'make staging?' is the wordplay.
I cannot really see how this works, but
'make' could be 'produce' (synonyms) and 'produce' is found within the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for producer that I've seen before include "Person who finds finance for films or plays" , "Maker" , "Person responsible for putting on a play" , "Person who finds the finance for a film (8)." , "Zeffirelli perhaps" .)