Wailing female spirit (7)
I believe the answer is:
banshee
'wailing female spirit' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for banshee that I've seen before include "Wailing woman of Irish legend" , "Irish female spirit who warns of an impending death" , "Sign of imminent death" , "Wailing spirit of Irish folklore" , "Death-portending spirit" .)