Fat Edgar disheartened in pantry (6)
I believe the answer is:
larder
'pantry' is the definition.
(synonyms)
'fat edgar disheartened' is the wordplay.
'fat' becomes 'lard' (lard is a kind of fat).
'disheartened' suggests removing the centre (the middle or heart is removed).
'edgar' with its centre removed is 'er'.
'lard'+'er'='LARDER'
'in' acts as a link.
(Other definitions for larder that I've seen before include "Small room for storing food" , "Room or cupboard for food storage" , "Cupboard or small room for food" , "Person applying grease" , "Room or cupboard for storing food" .)