Crossword Genius

Sincere-sounding fellow (7)

Ross

I believe the answer is:

earnest

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

I cannot understand how the rest of the clue works.

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(Other definitions for earnest that I've seen before include "Sincere; determined" , "Eager, sincere" , "Seriously eager" , "Solemn; pledge" , "Intensely serious; token" .)

I've seen this clue in The Mirror.
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