Scrapes or scratches, possibly causing bad ears (7)
I believe the answer is:
'scrapes' is the definition.
('abrade' can be a synonym of 'scrape')
'causing bad ears' is the wordplay.
'causing' indicates an anagram.
'badears' anagrammed gives 'ABRADES'.
'or scratches possibly' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Another definition for abrades that I've seen is " Scratches".)