Female bird (3)
I believe the answer is:
hen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">female bird</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 hen that I've seen before include "Source of eggs" , "Domestic fowl" , "Adult female chicken" , "Female lobster, fowl" , "Farm bird" .)