Excursionist coming a cropper? (7)

I believe the answer is:

tripper

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'excursionist' is the definition.
('tripper' can be a synonym of 'excursionist')

I can't explain the remainder of the clue.

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(Other definitions for tripper that I've seen before include "One who makes an excursion" , "Someone out for day" , "Motorist just for fun" , "Someone on an excursion" , "One hoping to enjoy journey" .)

I've seen this clue in the Evening Standard.

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