In German legend, a siren said to lure boatmen to destruction (7)

I believe the answer is:

lorelei

(Other definitions for lorelei that I've seen before include "Legendary siren and rock in the R Rhine" , "Famous Rhine rock" , "Siren who lured sailors to shipwreck" , "Rhine rock famed for siren" , "Temptress" .)

I've seen this clue in The Independent.

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