Divorce would be too much for him (4)
I believe the answer is:
ivor
'him' is the definition.
'divorce would be too much' is the wordplay.
'be too much' indicates a hidden word (I've seen 'is too much' mean this (only some letters needed - the rest are 'too much')).
'IVOR' is hidden in the letters of 'divorce would'.
'for' is the link.
(Other definitions for ivor that I've seen before include "Fellow" , "Man's name" , "Cutler who was entertainingly eccentric" , "- Novello, writer of Keep the Home Fires Burning" , "Welsh actor, composer, singer" .)