Crossword Genius

Dangerous woman, but she will give warning (5)

Ross

I believe the answer is:

siren

I'm a little stuck... Click here to teach me more about this clue!

'warning' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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" .)

Want a hint initially instead of a full solution? Install my app