Wearing best suit maybe, but hurt (5)

I believe the answer is:

smart

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'hurt' is the definition.
(I know that hurt can be written as smart)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for smart that I've seen before include "Bright; sting" , "Intelligent; clean, tidy" , "Quick; tidy; sting" , "Clever - feel mild pain" , "Bright or dapper" .)

I've seen this clue in The Independent.

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