Animal's appendage (4)
I believe the answer is:
tail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">animal's appendage</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 tail that I've seen before include "bum" , "Follow - rear part of aeroplane" , "part of coat" , "Follow furtively like private detective" , "Comet's luminous trail" .)