Basis of wrestling? (3)
I believe the answer is:
mat
'basis of wrestling?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for mat that I've seen before include "Floor-pad" , "dull finish" , "Rough piece of floor-covering" , "Paint with a dull surface" , "knot" .)