Bee and Em (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bee and em</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 aunts that I've seen before include "Relatives get bad US tan" , "Parents' sisters" , "Relatives get a peculiar US tan" , "Sally and others" , "Elderly female relations" .)