Feeder shortly scoffing last of soup (5)
I believe the answer is:
spoon
'feeder' is the definition.
(I've seen this before)
'shortly scoffing last of soup' is the wordplay.
'shortly' becomes 'soon' (synonyms).
'scoffing' indicates putting letters inside.
'last of' indicates one should take the final letters.
The final letter of 'soup' is 'p'.
'soon' enclosing 'p' is 'SPOON'.
(Other definitions for spoon that I've seen before include "Eating implement" , "Cuddle" , "cooking utensil" , "One with bowl" , "'He that sups with the devil should have a long . . . . .'" .)