Short-term policies involving sheet music? (5,5)
I believe the answer is:
cover notes
'short-term policies' is the definition.
'sheet music?' is the wordplay.
I cannot quite understand how this works, but
'music?' could be 'note' ('note' can be a synonym of 'musical note') and 'note' is found in the answer.
The remaining letters 'covers' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'involving' acts as a link.
Can you help me to learn more?
(Another definition for cover notes that I've seen is " papers for insurance".)