Siren indicating danger to Rhine boatmen (7)

I believe the answer is:

lorelei

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

'siren' is the definition.
(Lorelei is an example)

I can't explain the remainder of the clue.

(Other definitions for lorelei that I've seen before include "Legendary siren luring Rhine boatmen to destruction" , "Rhine Rock where sirens once dwelled" , "voice to die for" , "Rhine Rock where siren lived" , "Jerk" .)

I've seen this clue in The Globe and Mail.

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