Green woodpecker (6)
I believe the answer is:
yaffle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">green woodpecker</span>' is the definition.<br/ ><span class="explanation-format__explanation">(term for the green woodpecker)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for yaffle that I've seen before include "Woodpecker (colloquial)" , "BIRD" , "Green woodpecker" , "tree surgeon?" .)