Crossword Genius

Something to commemorate a cause of tooth decay (6)

Ross

I believe the answer is:

plaque

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

'decay' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for plaque that I've seen before include "Dental coating" , "Brass memorial tablet" , "Build-up on teeth" , "Film on teeth that encourages caries" , "Memorial slab" .)

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.