Crossword Genius

Substitute "th" for "s," perhaps (4)

Ross

I believe the answer is:

lisp

(Other definitions for lisp that I've seen before include "peech impediment" , "Have difficulty pronouncing `s'" , "Thpeak like thith" , "Non-standard pronunciation" , "Be unable to pronounce S" .)

I've seen this clue in the Universal.
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