A stumbling excursion? (4)

I believe the answer is:

trip

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'excursion?' is the definition.
(I've seen this in other clues)

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

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(Other definitions for trip that I've seen before include "Run with light steps" , "A short journey - stumble on it" , "Set off for" , "Tour; slip" , "Catch one's foot" .)

I've seen this clue in the Evening Standard.

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