Given food by a fat-headed fellow (3)
I believe the answer is:
fed
'given food' is the definition.
(I've seen this in another clue)
'by a fat-headed fellow' is the wordplay.
'by' says to put letters next to each other.
'a fat-headed' becomes 'f' (this could be a standard abbreviation I've not previously seen).
'fellow' becomes 'ed' (I've seen this in other clues).
'f'+'ed' is 'FED'.
Can you help me to learn more?
(Other definitions for fed that I've seen before include "US agent" , "Given sustenance" , "Dished up food" , "Provided food for" , "Provided courses" .)