You heard right: cover of iconic song creates irritation (9)
I believe the answer is:
urticaria
'irritation' is the definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Maybe you can see an association between them that I don't see?
'you heard right cover of iconic song' is the wordplay.
'you heard' becomes 'U' (homophone of 'you').
'right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'cover of' means to remove the middle letters (only the letters which cover the word).
'song' becomes 'aria' (piece of music in an opera).
'iconic' with its middle taken out is 'ic'.
'u'+'rt'+'ic'+'aria'='URTICARIA'
'creates' acts as a link.
Can you help me to learn more?
(Other definitions for urticaria that I've seen before include "complaint" , "Nettlerash" , "Nettle rash" , "hives" .)