Crossword Genius

Dull to get involved with (3)

Ross

I believe the answer is:

mat

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'dull' is the definition.
(similar in meaning)

I cannot understand how the rest of the clue works.

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(Other definitions for mat that I've seen before include "Small rug" , "Small protective floor-covering" , "What the cat sat on?" , "Opening of good book" , "Floor-pad" .)

I've seen this clue in the Evening Standard.
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