Pass through (9)
'pass through' is the definition.
(synonyms)
This is all the clue.
(Other definitions for transit that I've seen before include "Shipment from A to B" , "Passage of planet across the disc of the sun" , "Pass across/through" , "In migration" , "Journey across" .)
'pass through' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for penetrate that I've seen before include "Go through" , "Pierce" , "Run through" , "Force way through, into" , "probe" .)