Neck of mutton (5)
I believe the answer is:
scrag
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">neck of mutton</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 scrag that I've seen before include "The inferior end of a neck of mutton" , "Lean end of mutton neck" , "End of neck - beat up" , "Poor quality meat - throttle" , "Bony part of the neck" .)