Haunch (3)
I believe the answer is:
hip
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">haunch</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 hip that I've seen before include "it can nowadays be replaced" , "Fruit of the wild rose (3)" , "Rose fruit; start of cheer" , "flask here?" , "Cool < fruit" .)