Having a growing potential (6)

I believe the answer is:

arable

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'potential' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for arable that I've seen before include "fit for ploughing" , "may be ploughed through" , "Land used for crops" , "Of land, fit for cultivation" , "Ploughland" .)

I've seen this clue in the Evening Standard.

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