Crossword Genius

Speech therapist's focus, perhaps (4)

Ross

I believe the answer is:

lisp

(Other definitions for lisp that I've seen before include "Be unable to pronounce S" , "Have difficulty pronouncing `s'" , "Slight speech impediment" , "Speak with defective sibilants" , "speak imperfectly" .)

I've seen this clue in the Universal.
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