Gratify by compliance (6)
I believe the answer is:
humour
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gratify by compliance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for humour that I've seen before include "Disposition" , "Mood or something funny" , "Temperament; comedy" , "The quality of being funny" , "A funny thing" .)