He may work in a gallery (5)
I believe the answer is:
miner
'he' is the definition.
'work in a gallery' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
This explanation may well be incorrect...
'may' acts as a link.
Can you help me to learn more?
(Other definitions for miner that I've seen before include "it's the pits, for me" , "Underground labourer" , "Underground worker" , "Burrowing insect" , "Person who works underground" .)