He would hold a man to be a gypsy (3)
I believe the answer is:
roy
'he' is the definition.
(I know that Roy is a male given name)
'would hold a man to be a gypsy' is the wordplay.
I cannot quite see how this works, but
'man' could be 'r' (abbreviation for rook, a chess piece or 'man') and 'r' is present in the answer.
The remaining letters 'oy' is a valid word 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 roy that I've seen before include "Rob --, Scots outlaw" , "Rob . . . was a famous Scottish outlaw" , "- Orbison, US singer" , "'Rob ..., ... Rogers (3)'" , "'... Rogers, old film star cowboy (3)'" .)