What inept boxers hit? (6)

I believe the answer is:

canvas

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'hit?' 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 don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for canvas that I've seen before include "Artist's cloth" , "A painter paints on it" , "Fabric for sail, tent and picture" , "Material for tents, etc" , "Heavy, closely-woven fabric" .)

I've seen this clue in The Sun.

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