Was inclined to have music in a vehicle (6)
I believe the answer is:
sloped
'was inclined' is the definition.
(I've seen this before)
'have music in a vehicle' is the wordplay.
'have music' becomes 'op' (I am not sure about this - if you are sure you should believe this answer much more).
'in' means one lot of letters goes inside another.
'a vehicle' becomes 'sled' (sled is a kind of vehicle).
'op' put within 'sled' is 'SLOPED'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for sloped that I've seen before include "Running downwards" , "Was inclined" , "Tilted, canted" .)