Has been changed in spirit (7)
I believe the answer is:
banshee
'spirit' is the definition.
(spirit in Irish mythology)
'has been changed' is the wordplay.
'changed' indicates anagramming the letters.
'has'+'been'='hasbeen'
'hasbeen' anagrammed gives 'BANSHEE'.
'in' acts as a link.
(Other definitions for banshee that I've seen before include "Wailing female spirit" , "Wailing woman warning of a death" , "Wailing spirit of Irish folklore" , "Mythical Gaelic wailing woman" , "'Wailing woman, warns of impending death (7)'" .)