Possible Clues:

• Inadequate child, lad falling short, reticent no end? Nonsense!
• Prevent from happening
• Put an end to bookish loony dropping round
• Unwelcome end
• Put a stop to one born in Greek island hospital
• Put paid to king, moving bishop not pawn
• Stop child wiping bottom on bunk
• Prevent (something) from happening
• Stop child's endless nonsense
• Put a stop to glitch so bike keeps up