Figure how to cultivate the allotment (5)

I believe the answer is:

digit

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'figure' is the definition.
(numerical figure)

I don't understand the rest of the clue.

(Other definitions for digit that I've seen before include "Finger, thumb or toe" , "one's given?" , "Single number" , "Single numeral" , "Need a bit of a hand" .)

I've seen this clue in the Evening Standard.

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