Record musical covers to express sorrow (6)
I believe the answer is:
repent
'express sorrow' is the definition.
(I've seen this in another clue)
'record musical covers' is the wordplay.
'record' becomes 'EP' (abbreviation for extended play record).
'musical' becomes 'rent' (Rent is an example).
'covers' indicates putting letters inside.
'ep' placed inside 'rent' is 'REPENT'.
'to' acts as a link.
(Other definitions for repent that I've seen before include "Feel sincere regret" , "Feel or express contrition" , "Feel regret/remorse" , "Feel guilty" , "John the Baptist's cry" .)