Crossword Genius

Certain sib (3)

Ross

I believe the answer is:

sis

'certain sib' 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 "Family member (informal)" , "relative" , "Secret Intelligence Service (abbr.)" , "Relative's" , "Secret Intelligence Service (abbreviation)" .)

I've seen this clue in The Washington Post, the Penny Press, the USA Today, The New York Times, the Universal and the LA Times.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.