Good puzzle for cook (7)
I believe the answer is:
griddle
'cook' is the definition.
(to cook with a griddle)
'good puzzle' is the wordplay.
'good' becomes 'g' (abbreviation).
'puzzle' becomes 'riddle' (a riddle is a puzzle or problem).
'g'+'riddle'='GRIDDLE'
'for' is the link.
(Other definitions for griddle that I've seen before include "Circular iron plate used for baking" , "Heated metal cooking surface" , "cooking accessory" , "cooking utensil" , "Is it a hot surface" .)