Speech Difficulty With Pronouncing "s" and "z"

This page is the CodyCross answer for the clue below from Concert Hall, Group 594, Puzzle 5 (Percussion and Strings).

Question is: Speech Difficulty With Pronouncing "s" and "z"

and the answer is: LISPING

Word Meaning:

LISPING — present participle and gerund of lisp

Definitions from Wiktionary.