Sister (3)
I believe the answer is:
nun
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sister</span>' is the definition.<br/ ><span class="explanation-format__explanation">(sister is a term of address for a nun)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nun that I've seen before include "Holy sister" , "Member of religious order" , "Convent dweller" , "nuisance in pine forest" , "She's a member of a religious community" .)