Ballet dancer's knee bend (4)
I believe the answer is:
plie
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ballet dancer's knee bend</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for plie that I've seen before include "Classic ballet posture" , "Ballet movement bending knees while upright" , "8 [BALLET] term" , "Knees-bend ballet posture" , "Dance move" .)