Female siblings (7)
I believe the answer is:
sisters
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">female siblings</span>' is the definition.<br/ ><span class="explanation-format__explanation">(sister is a kind of female sibling)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sisters that I've seen before include "Nuns - nurses - siblings" , "Female siblings" , "Nuns' titles" , "Patient attention required from such" , "Family relatives" .)