Crossword Genius

Very much without humour (9)

Ross

I believe the answer is:

seriously

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'very much' is the definition.
(seriously can mean to a great degree)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for seriously that I've seen before include "In a solemn and thoughtful manner" , "Gravely" .)

I've seen this clue in The Times.
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