Dangerous woman, but she will give warning (5)
I believe the answer is:
siren
This clue could be a double definition.
'dangerous woman' is the first definition.
(I've seen this in another clue)
'warning' is the second definition.
(I've seen this before)
'but she will give' is the link.
This may not be right. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for siren that I've seen before include "Dangerously fascinating woman" , "Loud whistle for sea temptress" , "Nymph supposed to have lured sailors to destruction on rocks" , "Rinse (anag) - sea nymph" , "Loud whistle or sea witch" .)