Instruments in a car so complicated (8)
I believe the answer is:
ocarinas
'instruments' is the definition.
(ocarina is a kind of instrument)
'in a car so complicated' is the wordplay.
'complicated' indicates an anagram (a complex or confusing ordering of the letters).
'in'+'a'+'car'+'so'='inacarso'
'inacarso' with letters rearranged gives 'OCARINAS'.
(Other definitions for ocarinas that I've seen before include "Can I soar above the musical toys" , "musical instruments" , "Ancient egg-shaped wind instruments" , "No air sac, strangely, on the wind instruments" , "MUSICAL INSTRUMENT" .)