Cross-examining cook over misplaced gin (8)
I believe the answer is:
grilling
'cross-examining' is the definition.
(grill can mean to question or cross-examine)
'cook over misplaced gin' is the wordplay.
'cook' becomes 'grill' (grilling is a form of cooking).
'over' says to put letters next to each other.
'misplaced' indicates anagramming the letters (letters in the wrong places).
'gin' with letters rearranged gives 'ing'.
'grill'+'ing'='GRILLING'
(Other definitions for grilling that I've seen before include "Cooking by direct exposure to radiant heat" , "Severe questioning - in oven?" .)