Crossword Genius

Quite early to be so advanced (4)

Ross

I believe the answer is:

soon

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'quite early' is the definition.
'soon' can be an answer for 'early' (I've seen this before). I am not sure about the 'quite' bit.

'so advanced' is the wordplay.
'advanced' becomes 'on' (I can't justify this - if you can you should believe this answer much more).
'so'+'on'='SOON'

'to be' acts as a link.

Can you help me to learn more?

(Other definitions for soon that I've seen before include "Before long" , "Before you can say Jack Robinson" , "In the near future" , "Early, in a short time" , "Willingly" .)

I've seen this clue in the Evening Standard.
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