Excitement can be free after a trip? (4)

I believe the answer is:

kick

I'm a little stuck... Click here to teach me more about this clue!

'excitement' is the definition.
(I know that kick is a type of excitement)

I don't understand the rest of the clue.

(Other definitions for kick that I've seen before include "Promote in order to get out of he way" , "Punt - may be free for soccer players!" , "Thrill of excitement" , "Apply foot to" , "Boot; stimulant effect" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.