Journey time split (4)
I believe the answer is:
trip
'journey' is the definition.
(I've seen this before)
'time split' is the wordplay.
'time' becomes 't'.
'split' becomes 'rip' ('rip' can be a synonym of 'split').
't'+'rip'='TRIP'
(Other definitions for trip that I've seen before include "Set off for" , "Pleasure excursion" , "Excursion (while on drugs?)" , "holiday" , "Accidental misstep" .)