Cook — quiz (5)
I believe the answer is:
grill
This clue is a double definition.
'cook' is the first definition.
(grilling is a form of cooking)
'quiz' is the second definition.
(subject to questioning)
(Other definitions for grill that I've seen before include "Screen" , "Question aggressively" , "pump" , "quiz?" , "Framework of metal bars" .)