Crossword Genius

Briefly perform without preparation, starting early to become better (7)

Ross

I believe the answer is:

improve

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'become better' is the definition.
(synonyms)

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

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(Other definitions for improve that I've seen before include "Become better" , "Change for the better" , "Polish" , "Get or make better" , "Train" .)

I've seen this clue in The Irish Times.
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