An avalanche would be too much for him (4)
I believe the answer is:
alan
'him' is the definition.
'an avalanche would be too much' is the wordplay.
'be too much' indicates the answer is hidden within the clue (I've seen 'is too much' mean this (only some letters needed - the rest are 'too much')).
'ALAN' is hidden within 'avalanche would'.
'for' is the link.
(Other definitions for alan that I've seen before include "- Bennett, English actor, dramatist, writer" , "Boy's name" , "-- Turing, mathematician" , "-- Ayckbourn, English dramatist" , "Sir -- Sugar (The Apprentice)" .)