Stag's mate (3)
I believe the answer is:
doe
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stag's mate</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 doe that I've seen before include "female of the species" , "Feminine counterpart of stag" , "Female hare" , "Animal" , "She eats vegetarian food" .)