Heron (5)
I believe the answer is:
egret
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">heron</span>' is the definition.<br/ ><span class="explanation-format__explanation">(egret is a kind of heron)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for egret that I've seen before include "Wader with white plumage" , "Heron-like wader" , "Bird eating fish" , "Seabird" , "One wading" .)