Official order given to young lady in vehicle (9)
I believe the answer is:
commissar
'official' is the definition.
(commissar is a kind of official)
'order given to young lady in vehicle' is the wordplay.
'order' becomes 'om' (order of merit**).
'given to' says to put letters next to each other.
'young lady' becomes 'miss' ('miss' can be a synonym of 'young lady').
'in' means one lot of letters goes inside another.
'vehicle' becomes 'car' (car is a kind of vehicle).
'om'+'miss'='ommiss'
'ommiss' placed within 'car' is 'COMMISSAR'.
(Other definitions for commissar that I've seen before include "Communist official" , "Party official" , "Soviet official" , "USSR official" .)