Small duck (4)
I believe the answer is:
teal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">small duck</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 teal that I've seen before include "Small freshwater duck and colour" , "Variety of duck" , "bird" , "Variety of small ducks" , "Strange tale of a duck" .)