Related Clues:

• Sylvester's speech feature
• Struggle with "s" sounds
• Struggle with 's' sounds
• Sylvester the Cat's speech problem
• Have trouble with chess?
• Certain speech defect
• Oratory obstacle
• Disorder that's heard in street, attack knocking leader out
• Not get some Z's, say?
• Have problems with the letter S
• Speech therapy target
• Tip-of-the-tongue phenomenon
• Struggle with sibilants
• Have trouble saying "silly"
• Speech therapy focus