Cover western hit (4)
I believe the answer is:
wrap
'cover' is the definition.
(wrapping is a kind of covering)
'western hit' is the wordplay.
'western' becomes 'w'.
'hit' becomes 'rap' (rap can mean to knock or hit).
'w'+'rap'='WRAP'
(Other definitions for wrap that I've seen before include "Finish filming" , "Flatbread snack" , "Enclose completely" , "Enclose in paper, for example" , "Shawl - fold in paper" .)