Crossword Genius

Tree area rising, becoming adequate (5)

Ross

I believe the answer is:

ample

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

I don't understand how the rest of the clue works.

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(Other definitions for ample that I've seen before include "Easily sufficient" , "Full-figured" , "Buxom" , "Fairly large" , "Large enough" .)

I've seen this clue in The Independent.
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