Passing model went to pose (7)
I believe the answer is:
transit
'passing' is the definition.
(transit can mean passing or travelling across)
'model went to pose' is the wordplay.
'model' becomes 'T' (Ford Model T car).
'went' becomes 'ran' ('run' can be a synonym of 'go').
'to pose' becomes 'sit' (synonyms).
't'+'ran'+'sit'='TRANSIT'
(Other definitions for transit that I've seen before include "Movement (of goods)" , "Passage of planet across the disc of the sun" , "In migration" , "Moving" , "Pass across" .)