Charge department for meal (4)
I believe the answer is:
feed
'meal' is the definition.
(I've seen this in other clues)
'charge department' is the wordplay.
'charge' becomes 'fee' (fee is a kind of charge).
'department' becomes 'd' (abbreviation eg in MOD Ministry of Defence).
'fee'+'d'='FEED'
'for' acts as a link.
(Other definitions for feed that I've seen before include "Given payment" , "take courses" , "Give food to; eat" , "Paid" , "Take food" .)