Crossword Genius

Nearly everybody of the greatest importance (9)

Ross

I believe the answer is:

mostofall

I'm a little stuck... Click here to teach me more about this clue!

'the greatest importance' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'nearly everybody' is the wordplay.
'nearly' becomes 'mostof' (I can't justify this - if you can you should give a lot more credence to this answer).
'everybody' becomes 'all' (all people).
'mostof'+'all'='MOSTOFALL'

'of' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish News.
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