Marvel seeing vehicle turning in distance (7)
I believe the answer is:
miracle
'marvel' is the definition.
(thesaurus)
'vehicle turning in distance' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'turning' says the letters should be written in reverse.
'in' indicates putting letters inside.
'distance' becomes 'mile'.
'car' in reverse letter order is 'rac'.
'rac' placed inside 'mile' is 'MIRACLE'.
'seeing' is the link.
(Other definitions for miracle that I've seen before include "Remarkable occurrence" , "Phenomenon" , "Inexplicable wonder" , "Supernatural act of God" , "Unexplained wonder" .)