Crossword Genius

Relative from Zurich for example, oddly? (3)

Ross

I believe the answer is:

sis

'relative' is the definition.
(short for sister)

I can't explain the rest of the clue.

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

I've seen this clue in The Times.
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