A cheeky rhyme about a scholar who once turned up on time and now saunters in at noon. The nonsense opening line is just there for the sound of it, and children pick up the rhythm fast.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
A diller, a dollar, a ten o'clock scholar!
What makes you come so soon?
You used to come at ten o'clock,
But now you come at noon.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition