Curving (7)
I believe the answer is:
bending
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">curving</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 bending that I've seen before include "What's facilitated by joint" , "Stooping" , "Curving" .)