Minister I put in front of Vatican vehicle (5)
I believe the answer is:
vicar
'minister' is the definition.
(thesaurus)
'i put in front of vatican vehicle' is the wordplay.
'put in' indicates putting letters inside.
'front of' suggests taking the first letters.
'vehicle' becomes 'car' (car is a kind of vehicle).
The first letter of 'vatican' is 'v'.
'v'+'car'='vcar'
'i' placed inside 'vcar' is 'VICAR'.
(Other definitions for vicar that I've seen before include "Man with a dog collar" , "Member of the clergy" , "one brought in for service?" , "Parson" , "Parish incumbent" .)