Lacking stiffness (4)
I believe the answer is:
limp
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">lacking stiffness</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 limp that I've seen before include "Saggy and drooping" , "Lacking stiffness" , "Feeble" , "Flabby - halt" , "Walk with an injury" .)