Crossword Genius

Palindromic family nickname (3)

Ross

I believe the answer is:

sis

'palindromic family nickname' 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 "spies ..." , "Sibling (informal)" , "relative" , "Relative's" , "Secret Intelligence Service (abbr.)" .)

I've seen this clue in the USA Today, the Universal and the Ink Well xwords.
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