Fire over pit needed for grill (7)
I believe the answer is:
examine
'grill' is the definition.
(I know that grill is a kind of examine)
'fire over pit' is the wordplay.
'fire' becomes 'axe' (I've seen this in another clue).
'over' is a reversal indicator.
'pit' becomes 'mine' (mining pit).
'axe' in reverse letter order is 'exa'.
'exa'+'mine'='EXAMINE'
'needed for' acts as a link.
(Other definitions for examine that I've seen before include "Inspect; question in court" , "vet" , "Question (a witness)" , "Question closely" , "Formally question (law)" .)