Egg layer (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">egg layer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hen that I've seen before include "Female bird" , "This party is for women only" , "Not cock" , "Domestic egg layer" , "Laying bird" .)