Instrument from old vehicle in front of Audi (7)
I believe the answer is:
ocarina
'instrument' is the definition.
(ocarina is a kind of instrument)
'old vehicle in front of audi' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'vehicle' becomes 'car' (car is a kind of vehicle).
'front of' suggests taking the first letters.
The initial letter of 'audi' is 'a'.
'o'+'car'+'in'+'a'='OCARINA'
'from' acts as a link.
(Other definitions for ocarina that I've seen before include "it's blown in pieces" , "Toy-like wind instrument" , "Simple wind instrument" , "Egg-shaped wind instrument with finger holes" , "source of music" .)