Crossword Genius

Darker Cornish paintings maybe more popular if very quietly forgotten (9)

Ross

I believe the answer is:

swarthier

I'm a little stuck... Click here to teach me more about this clue!

'darker' is the definition.
Both the answer and definition are comparative adjectives. Perhaps there's an association between them I don't understand?

'cornish paintings maybe more popular if very quietly forgotten' is the wordplay.
I cannot really understand how this works, but
'cornish' could be 'sw' (Cornwall is in the South West of England) and 'sw' is found within the answer.
'paintings' could be 'art' (painting is an art) and 'art' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Independent.
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