Related Clues:

• Smile — all that could be seen of the vanishing Cheshire Cat
• Smile when difficult job is cut short
• Sound amused
• Smile, taking day off from hard work
• Smile, finding rook in trap
• Charge on street removed as a ridiculous thing
• Cachinnate
• Break up? Note: that's horrible
• Hard work finishes early ... producing this?
• Note that's disgusting — but it makes us chuckle
• Look happy when dull work is nearly done
• Progress slowly without teacher, and smile
• Look pleased as hard work ends early
• Sheepish smile
• Find humour in, where there's not a grain