In from France entering passage, temporary (9)
I believe the answer is:
transient
'temporary' is the definition.
(similar in meaning)
'in from france entering passage' is the wordplay.
'in from france' becomes 'en' ('in' in French).
'entering' means one lot of letters goes inside another.
'passage' becomes 'transit' (synonyms).
'en' placed within 'transit' is 'TRANSIENT'.
(Other definitions for transient that I've seen before include "Fleeting" , "gone in a trice!" , "on the move" , "Lasting little time" , "Here today, gone tomorrow" .)