Crossword Genius

Unmarried sisters (4)

Ross

I believe the answer is:

nuns

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'sisters' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nuns that I've seen before include "Convent residents" , "Women in religious vocations" , "Religious sisters" , "women in order" , "Sisters in order" .)

I've seen this clue in The Globe and Mail.
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