Fall excursion (4)
I believe the answer is:
trip
I believe this clue is a double definition.
'fall' is the first definition.
(as in tripping over)
'excursion' is the second definition.
(a trip is an excursion or outing)
(Other definitions for trip that I've seen before include "Pleasure excursion" , "Device working a trap or alarm when stumbled over" , "A short journey - stumble on it" , "... the light fantastic to dance" , "Journey; make a mistake" .)