Practised without weakening (4)

I believe the answer is:

neat

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'practised' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?

I don't understand the remainder of the clue.

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(Other definitions for neat that I've seen before include "well-kept" , "As whisky may be" , "Finished" , "bull, eg" , "Very good American" .)

I've seen this clue in the Evening Standard.

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