Kite stabilizer (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">kite stabilizer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tail that I've seen before include "Flexible part that extends from an animal's rear" , "Comet's luminous trail" , "Dog - or part of one" , "Follow; end part" , "Follow -- rear end" .)