Bringer of bad luck (5)
I believe the answer is:
jonah
'bringer of bad luck' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for jonah that I've seen before include "Prophet swallowed by whale" , "jinx" , "Reluctant prophet" , "Person believed to bring bad luck" , "Prophet - bringer of bad luck" .)