In a serious manner (9)

I think it could be either:

Which length description are you looking for?:

earnestly

'in a serious manner' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for earnestly that I've seen before include "Showing serious intent" , "Showing commitment" , "Zealously" , "with heart and soul" , "with gusto" .)

I've seen this clue in the Sydney Morning Herald.

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