Style of 70s music on road exhibits jarring noise (7)
I believe the answer is:
discord
'noise' is the definition.
(thesaurus)
'style of 70s music on' is the wordplay.
'style of 70s' becomes 'rd' (I can't explain this - if you can you should believe this answer much more).
'music' becomes 'disco' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'rd' put after 'disco' is 'DISCORD'.
'road exhibits jarring' is the link.
This may not be right. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for discord that I've seen before include "Lack of agreement" , "cacophony" , "Friction" , "Dissension" , "Strife, lack of harmony" .)