Stumbles on journeys (5)
I believe the answer is:
trips
This clue is a double definition.
'stumbles' is the first definition.
('trip' can be a synonym of 'stumble')
'journeys' is the second definition.
(I know this)
'on' acts as a link.
(Other definitions for trips that I've seen before include "Journeys or excursions" , "Stumbles on short journeys?" , "Outings" , "is hallucinating" , "good experiences" .)