Serious, sincere (7)

I believe the answer is:

earnest

I believe this clue is a double definition.

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

'sincere' is the second definition.
(I know that sincere can be written as earnest)

(Other definitions for earnest that I've seen before include "Sincere; enthusiastic" , "Intensely serious; token" , "Art worthy" , "money involved in contract" , "Showing sincere and intense conviction" .)

I've seen this clue in the Irish Times (Simplex), The Times, the Sydney Morning Herald and The Telegraph.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.