Instrument in old vehicle in African capital (7)
I believe the answer is:
ocarina
'instrument' is the definition.
(I know that ocarina is a type of wind)
'old vehicle in african capital' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'vehicle' becomes 'car' (car is a kind of vehicle).
'capital' says to take the initial letters.
The initial letter of 'african' is 'a'.
'o'+'car'+'in'+'a'='OCARINA'
'in' is the link.
(Other definitions for ocarina that I've seen before include "Terracotta wind instrument" , "Flute-toned musical toy" , "Play a musical toy in the ICA, Nora" , "Egg-shaped wind instrument with finger holes" , "Old wind instrument" .)