Cover charge for audience (4)
I believe the answer is:
wrap
'cover' is the definition.
(wrapping is a kind of covering)
'charge for audience' is the wordplay.
'charge' becomes 'rap' (I've seen this in another clue).
'for audience' indicates a 'sounds like' (homophone) clue.
'rap' is a homophone of 'WRAP'.
(Other definitions for wrap that I've seen before include "Finish recording; filled tortilla" , "Pack in paper; shawl" , "package" , "Enclose in paper or material" , "Bathrobe" .)