Weird has-beens warn of impending doom (8)
I believe the answer is:
banshees
'warn of impending doom' is the definition.
I can't tell whether this definition defines the answer.
'weird has-beens' is the wordplay.
'weird' is an anagram indicator.
'has'+'beens'='hasbeens'
'hasbeens' with letters rearranged gives 'BANSHEES'.
Can you help me to learn more?
(Other definitions for banshees that I've seen before include "Female spirits, they warn of impending death" , "Wailing women of Gaelic myth - kind of has-beens" , "Female Gaelic death-portending spirits - now kind of has-beens" , "Gaelic keening women of myth" , "Mythical Gaelic keening women" .)