Crossword Genius

A good one can always grow better (8)

Ross

I believe the answer is:

gardener

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'better' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see a link between them that I can't see?

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

Can you help me to learn more?

(Other definitions for gardener that I've seen before include "One grows" , "Plant tender" , "Plant and veg grower" , "He tends flowers and shrubs" , "Garnered by worker on cultivated ground" .)

I've seen this clue in The Globe and Mail.
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