Spend a long time making journeys (8)
I believe the answer is:
passages
'journeys' is the definition.
(passage is a kind of journey)
'spend a long time' is the wordplay.
'spend' becomes 'pass' ('pass' can be a synonym of 'spend').
'a long time' becomes 'ages' (I've seen this before).
'pass'+'ages'='PASSAGES'
'making' acts as a link.
(Other definitions for passages that I've seen before include "Texts" , "Paths between buildings" , "Corridors, ways through" , "Sections of a text" , "Narrow streets or routes" .)