Something to eat when one of the minions entertains king? (5)
I believe the answer is:
prawn
'something to eat' is the definition.
(prawn is a kind of food)
'one of the minions entertains king?' is the wordplay.
'one of the minions' becomes 'pawn' (pawn can mean someone manipulated by others).
'entertains' means one lot of letters goes inside another.
'king?' becomes 'R' (abbreviation for rex, king in Latin).
'pawn' enclosing 'r' is 'PRAWN'.
'when' acts as a link.
(Other definitions for prawn that I've seen before include "Shellfish" , "Small tasty crustacean, nice in cocktail" , "Popular oriental snack" , "Cocktail ingredient" , "Cocktail item" .)