Sightseeing trip (4)
I believe the answer is:
tour
'sightseeing trip' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tour that I've seen before include "Extensive journey" , "Go on holiday or inspection journey" , "Rout (anag.)" , "Journey round" , "Trip visiting several places" .)