Wading bird; frilly collar (4)
I believe the answer is:
ruff
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">wading bird</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(ruff is a kind of wading bird)</span><br/ ><br/ >'<span class="explanation-format__original">frilly collar</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for ruff that I've seen before include "Trump; male shore bird" , "High tight collar" , "Eurasian sandpiper -- Australian fish" , "Fish; neck frill" , "Extravagant collar" .)