Crossword Genius

Have trouble with one's sisters? (4)

Ross

I believe the answer is:

lisp

(Other definitions for lisp that I've seen before include "Thpeak like thith" , "Talk like thith" , "Slip into speech defect" , "Speak with defective sibilants" , "peech impediment" .)

I've seen this clue in the LA Times.
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