It's a wonder the vehicle reversed within the distance (7)
I believe the answer is:
miracle
'it's a wonder' is the definition.
(thesaurus)
'the vehicle reversed within the distance' is the wordplay.
'the vehicle' becomes 'car' (car is a kind of vehicle).
'reversed' says the letters should be written backwards.
'within' means one lot of letters goes inside another.
'the distance' becomes 'mile'.
'car' reversed gives 'rac'.
'rac' inserted inside 'mile' is 'MIRACLE'.
(Other definitions for miracle that I've seen before include "Extraordinary event" , "Supernatural happening" , "Amazing event" , "Marvel" , "Saintly deed" .)