Related Clues:

• Pitch to one side
• Groupspeak, e.g.
• Is unable to
• Gang's slanguage
• Naysayer's word
• Lacks what it takes
• Secret vocabulary
• Slang
• Isn't 25-Across
• Trade talk?
• Shop jargon
• Trade talk, e.g.
• Singsong speech
• Lawyerese, e.g.
• Unable to