Serious art making money? (7)

I believe the answer is:

earnest

This clue is a double definition.

'serious' is the first definition.
('earnest' can be similar in meaning to 'serious')

'art making money?' is the second definition.
(I've seen this before)

(Other definitions for earnest that I've seen before include "Serious in intention" , "Sneer at (anag) -- serious" , "Showing sincere and intense conviction" , "showing seriousness" , "See 1" .)

I've seen this clue in The Times.

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