Stumbles on excursions (5)
I believe the answer is:
trips
I believe this clue is a double definition.
'stumbles' is the first definition.
(I know this)
'excursions' is the second definition.
(I've seen this in another clue)
'on' is the link.
(Other definitions for trips that I've seen before include "Journeys or excursions" , "Stumbles or triggers" , "Stumbles on short journeys?" , "is hallucinating" , "good experiences" .)