Green cormorant (4)
I believe the answer is:
shag
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">green cormorant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for shag that I've seen before include "Bird - dance" , "Diver" , "Coarse tobacco - cormorant" , "As water bird" , "Green cormorant" .)