Crossword Genius

Family name (3)

Ross

I believe the answer is:

sis

'family name' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sis that I've seen before include "Family member (informal)" , "Girl" , "Secret Intelligence Service (abbr.)" , "Relative's" , "Secret Intelligence Service (abbreviation)" .)

I've seen this clue in the Newsday.
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