He may have a special suit for work (5)
I believe the answer is:
diver
'he may have a special suit for work' 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 'iver' and 'iver' is found within the answer.
A single letter 'd' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for diver that I've seen before include "Frogman" , "Cheating footballer" , "Person operating under water" , "Competitor in pool" , "Drive (anag.)" .)