Creature in Greek mythology with the head and trunk of a woman and wings of a bird (5)
I believe the answer is:
harpy
(Other definitions for harpy that I've seen before include "Mythic bird with a woman's head" , "Nasty woman" , "Ravenous monster -- nagging woman" , "Rapacious woman-bird" , "Ravenous mythical woman with body of a bird" .)