Crossword Genius

Relative: 'M' for it in audible accent? (3)

Ross

I believe the answer is:

sis

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

I can't explain the rest of the clue.

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

I've seen this clue in The Guardian.
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