Man and wife into god (4)
I believe the answer is:
pawn
'man' is the definition.
(man can mean a chess piece)
'wife into god' is the wordplay.
'wife' becomes 'w' (abbreviation).
'into' indicates putting letters inside.
'god' becomes 'pan' (Pan is a Greek god).
'w' put within 'pan' is 'PAWN'.
'and' is the link.
(Other definitions for pawn that I've seen before include "Deposit as security for a loan" , "Chesspiece" , "Person one used" , "Hostage; chessman" , "one used by another" .)