Ankle-knee connector (4)
I believe the answer is:
shin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ankle-knee connector</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 shin that I've seen before include "kick" , "Front part of the leg between knee and ankle" , "Lower foreleg" , "Cut of beef; part of leg" , "Front end of the tibia" .)