Crossword Genius

Bro's sibling (3)

Ross

I believe the answer is:

sis

'bro's sibling' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for sis that I've seen before include "relative" , "Little sibling" , "Family member (informal)" , "Secret Intelligence Service (abbr.)" , "spies ..." .)

I've seen this clue in the Penny Press, The Guardian, The New York Times, the King Feature Syndicate, the Newsday and The Wall Street Journal.
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