Crossword Genius

If you please, you could be in the present subjunctive (3)

Ross

I believe the answer is:

sis

(Other definitions for sis that I've seen before include "Secret Intelligence Service (abbreviation)" , "Secret Intelligence Service (abbr.)" , "Little sibling" , "Relative's" , "Sibling (informal)" .)

I've seen this clue in The Times.
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