Crossword Genius

Serious pledge (7)

Ross

I believe the answer is:

earnest

I believe this is a double definition.

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

'pledge' is the second definition.
(I've seen this before)

(Other definitions for earnest that I've seen before include "Eastern (anag.)" , "Showing sincere and intense conviction" , "guarantee" , "Oscar Wilde play 'The Importance of Being . . . . . . .'" , "Grave" .)

I've seen this clue in The Telegraph and The Times.
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