Crossword Genius

Better way to act: on impulse, ultimately (7)

Ross

I believe the answer is:

improve

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'better' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for improve that I've seen before include "Polish" , "Make progress" , "reform" , "Make better in quality" , "Change for the better" .)

I've seen this clue in The Times.
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