Crossword Genius

Serious article penned by Shackleton, perhaps (7)

Ross

I believe the answer is:

earnest

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

I don't understand the rest of the clue.

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(Other definitions for earnest that I've seen before include "Firm" , "Showing sincere and intense conviction" , "art making money?" , "Serious; down-payment" , "Grave" .)

I've seen this clue in The Telegraph.
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