Poles visit property in passing (7)
I believe the answer is:
transit
'in passing' is the definition.
(I've seen this before)
'poles visit property' is the wordplay.
'poles' becomes 'ns' (North and South poles).
'visit' is an insertion indicator.
'property' becomes 'trait' (I've seen this in another clue).
'ns' going within 'trait' is 'TRANSIT'.
(Other definitions for transit that I've seen before include "The process of going or passing - sic . . . . . . . gloria mundi" , "Change" , "Pass through; van" , "Movement from place to place" , "Movement (of goods)" .)