Answer:

lisp

Answer	Crossword Clue
LISP	Speech mannerism
LISP	Thpeak like thith
LISP	Speak like Sylvester

LISP	Talk like Sylvester
LISP	"Thpeak like thith"
LISP	Suffer from sigmatism
LISP	Speech problem
LISP	Speech defect
LISP	Botch sibilants
LISP	Sylvester's sputtering
LISP	Programming language

LISP	Baby-talk factor
LISP	"She sells seashells" problem
LISP	Talk like Daffy
LISP	Speech coach's challenge
LISP	Sylvester's trademark
LISP	Trouble with sibilants
LISP	Enunciation problem
LISP	Stumble through Assisi?

LISP	Childlike vocal affectation
LISP	Have trouble with sassafras?
LISP	Speak like Daffy
LISP	Struggle with assessors?
LISP	Stumble on Sesame Street?
LISP	Daffy's impediment
LISP	Speech impediment
LISP	Stumble over one's sisters?

LISP	Be challenged by one's sisters?
LISP	Have trouble with dismissals?
LISP	Sylvester's impediment
LISP	Have a problem ordering sirloin steak?
LISP	Sylvester's problem
LISP	Struggle with sassafras?
LISP	Speech imperfection
LISP	Speech therapist's concern

LISP	Daffy Duck has one
LISP	Problem for Sylvester the Cat
LISP	Sylvester's speaking problem
LISP	Say "something" wrong, perhaps
LISP	Thpeaker's thtumbling block