Rewind intro of extremely grating dismal song (5)
I believe the answer is:
dirge
'dismal song' is the definition.
'dirge' can be an answer for 'song' (dirge is a kind of song). I'm not sure about the 'dismal' bit.
'rewind intro of extremely grating' is the wordplay.
'rewind intro' becomes 'dir' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'of extremely' means to remove the middle letters (I've seen 'extremely' mean this (only the extremes of the word are used)).
'grating' becomes 'grate' (synonyms).
'grate' with its centre removed is 'ge'.
'dir'+'ge'='DIRGE'
Can you help me to learn more?
(Other definitions for dirge that I've seen before include "Sombre music" , "air?" , "No joy in this music" , "Song or hymn of mourning" , "Funeral lament" .)