Animal quarters (4)
(Other definitions for hind that I've seen before include "Female animal; at the back" , "posterior" , "Female red deer" , "Rear - female deer" , "Be much better than (someone)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">animal quarters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pens that I've seen before include "Literary thought or reflection" , "birds" , "Dashes off" , "Female swans" , "Writing implements" .)