Crossword Genius

A little coaster, perhaps (3)

Ross

I believe the answer is:

mat

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'a little coaster' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for mat that I've seen before include "Small rug" , "Thick flat pad on the floor" , "Rug; without a shine" , "Shoe-cleaner" , "Dull, rug" .)

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