Cultivate for cash (4)

I believe the answer is:

till

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

'for cash' is the wordplay.
'for' becomes 'til' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cash' becomes 'L' (The pound sterling symbol is an elaborate L).
'til'+'l'='TILL'

Can you help me to learn more?

(Other definitions for till that I've seen before include "Work the land for cultivation" , "Checkout - cultivate (land)" , "Farm - money drawer" , "Drawer holding money in shop." , "Money box" .)

I've seen this clue in the Evening Standard.

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