B*witched badly need to cover repetitive song (9)
I believe the answer is:
enchanted
'bwitched' is the definition.
'badly need to cover repetitive song' is the wordplay.
'badly' is an anagram indicator.
'to cover' is an insertion indicator.
'repetitive song' becomes 'chant' (I've seen this before).
'need' is an anagram of 'ened'.
'ened' placed around 'chant' is 'ENCHANTED'.
(Other definitions for enchanted that I've seen before include "delighted by spelling" , "Put under spell" , "Captivated" , "Bewitched" , "Beguiled" .)