Bit of excitement or fun, but it can hurt (4)

I believe the answer is:

kick

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'bit of excitement' is the definition.
(I've seen this in another clue)

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

(Other definitions for kick that I've seen before include "Buzz" , "Stop" , "Boot, thrill of pleasure" , "something thrilling" , "punch" .)

I've seen this clue in the Evening Standard.

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