Crossword Genius

Peter, at beginning of spring, cultivates (5)

Ross

I believe the answer is:

tills

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

I don't understand the remainder of the clue.

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(Other definitions for tills that I've seen before include "Ploughs land" , "Cash registers" .)

I've seen this clue in the Sydney Morning Herald.
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