Crossword Genius

Long-lasting stain finally covered by rug — it's coloured (9)

Ross

I believe the answer is:

chromatic

'coloured' is the definition.
(associated in meaning)

'long-lasting stain finally covered by rug' is the wordplay.
I cannot really see how this works, but
'by' could be 'at' and 'at' is found in the answer.
The remaining letters 'chromic' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'it's' acts as a link.

(Other definitions for chromatic that I've seen before include "in colours" , "colourful?" , "Trim coach (anag.)" , "With use of colour" .)

I've seen this clue in The Guardian.
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