A bit more income in spring (5)

I believe the answer is:

arise

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'spring' is the definition.
(I've seen this in another clue)

'a bit more income' is the wordplay.
'bit more income' becomes 'rise' (I can't justify this - if you can you should give a lot more credence to this answer).
'a'+'rise'='ARISE'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for arise that I've seen before include "Get to one's feet" , "Crop up" , "Wake up or get up" , "Come to light" , "Occur; stand up" .)

I've seen this clue in the Evening Standard.

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