Crossword Genius

Fam member (3)

Ross

I believe the answer is:

sis

'fam member' 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 "Sibling (informal)" , "spies ..." , "Family member (informal)" , "Secret Intelligence Service (abbr.)" , "relative" .)

I've seen this clue in The Washington Post, the LA Times and The New York Times.
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