Interrogate a cooker (5)
I believe the answer is:
grill
I believe this clue is a double definition.
'interrogate' is the first definition.
(I've seen this before)
'a cooker' is the second definition.
(device for grilling food)
(Other definitions for grill that I've seen before include "what restaurant has to offer?" , "Seriously question" , "interrogation?" , "quiz?" , "Cook by radiant heat" .)