Score with cover song (5,5)
I believe the answer is:
sheet music
'song' is the definition.
(I know that sheet music is a type of song)
'score with cover' is the wordplay.
'score' becomes 'music' (I've seen this before).
'with' is a charade indicator (letters next to each other).
'cover' becomes 'sheet' (sheeting is a kind of covering).
'music' after 'sheet' is 'SHEET MUSIC'.
(Other definitions for sheet music that I've seen before include "Printed part for performer" , "score" , "Leaves with scores" , "printed notepaper?" .)