Color close to aqua (4)
I believe the answer is:
teal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">color close to aqua</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 teal that I've seen before include "Bluish shade of green" , "Raise (subject matter)" , "Duck; greenish-blue colour" , "Dark green-blue; duck" , "Duck - dark greenish-blue" .)