Duck or goose (4)
I believe the answer is:
fowl
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">duck</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">goose</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for fowl that I've seen before include "eg hen" , "Cock or hen" , "Domestic birds" , "Any farmyard bird" , "Bird kept for eggs and meat" .)