Crossword Genius

Halle, to Chloe Bailey, for short (3)

Ross

I believe the answer is:

sis

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

I've seen this clue in the Universal.
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