Crossword Genius

It goes round in a race (4,5)

Ross

I believe the answer is:

mill wheel

I'm a little stuck... Click here to teach me more about this clue!

'it goes round in a race' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

Can you help me to learn more?

(Other definitions for mill wheel that I've seen before include "Harnesser of water power" , "Water-power device" .)

I've seen this clue in The Globe and Mail.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.