Grilling (5,6)
I believe the answer is:
third degree
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">grilling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I have seen 'Intense grilling' mean 'third degree' so perhaps 'grilling' could also mean 'third degree')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for third degree that I've seen before include "Demanding viva" , "Post-doctorate" , "ruthless grilling" , "Demanding quiz" , "doctorate, perhaps" .)