For the passage, the trains run to time (7)
I believe the answer is:
transit
'for the passage' is the definition.
('transit' can be a synonym of 'passage')
'trains run to time' is the wordplay.
'run' is an anagram indicator.
'to time' becomes 't' (abbreviation).
'trains' anagrammed gives 'transi'.
'transi'+'t'='TRANSIT'
'the' acts as a link.
(Other definitions for transit that I've seen before include "Movement (of goods)" , "Shipment from A to B" , "carriage" , "Journey across" , "Conveyance of goods or people - tin star (anag)" .)