The fellow ate the lot (4)
I believe the answer is:
fate
'the lot' is the definition.
(synonyms)
'the fellow ate' is the wordplay.
'the fellow' becomes 'F' (abbreviation - of a society etc.).
'f'+'ate'='FATE'
(Other definitions for fate that I've seen before include "Final issue" , "Predestiny" , "Destiny, kismet" , "E.g. Clotho, Atropos" , "Predestination" .)