Sagging (6)
I believe the answer is:
droopy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sagging</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for droopy that I've seen before include "Hanging limply - animated dog created by Tex Avery" , "Tending to 27 [SAG]" , "Lacking strength" , "Cartoon poodle" , "Cartoon dog - sagging" .)