He often stops while working (8)
I believe the answer is:
organist
'he often stops while working' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'he' is the wordplay.
I cannot quite understand how this works, but
'he' could be 'gan' and 'gan' is located in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for organist that I've seen before include "Accompanist, keyboard player" , "One plays in church usually" , "Church instr. player" , "Roasting (anag)" , "Cathedral musician" .)