Cartilage (7)
I believe the answer is:
gristle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cartilage</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gristle that I've seen before include "Stir leg to get tough tissue in meat" , "Glister with animal tissue" , "Stir leg (anag.)" , "Inedible cartilage" , "Sinew" .)