Suddenly rise well above the usual level (6,2)

I believe the answer is:

spring up

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'suddenly rise' is the definition.
'spring up' can be an answer for 'rise' (synonyms). I am unsure of the 'suddenly' bit.

'well above the usual level' is the wordplay.
'well' becomes 'spring' (a well is a spring of water).
'above' is a charade indicator (letters next to each other) (in a down clue, some letters go above others).
'the usual level' becomes 'up' (I can't justify this - if you can you should give a lot more credence to this answer).
'spring'+'up'='SPRING UP'

Can you help me to learn more?

(Another definition for spring up that I've seen is " Suddenly develop".)

I've seen this clue in The Globe and Mail.

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