Dinner for Dobbin (4)
I believe the answer is:
oats
'dinner for dobbin' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for oats that I've seen before include "Porridge mix" , "Cereal grass and seeds" , "Porridge ingredients" , "Cereal plants" , "Sow wild ones in disreputable youth" .)