Obscene song showing change of heart (5)
I believe the answer is:
dirty
'obscene' is the definition.
(similar in meaning)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dirty that I've seen before include "Lewd" , "Obscene - unfair" , "Mucky" , "1971 film with Clint Eastwood" , "Muddy" .)