Questioning a type of burn (5,6)
I believe the answer is:
third degree
I believe this clue is a double definition.
'questioning' is the first definition.
(third degree is a kind of questioning)
'a type of burn' is the second definition.
(Other definitions for third degree that I've seen before include "Intensive interrogation (or a doctorate!)" , "Post-doctorate" , "What you may study for after master's" , "doctorate, possibly?" , "kind of burns" .)