Crossword Genius

She's dangerous, especially to boatmen (7)

Ross

I believe the answer is:

lorelei

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'she's' is the definition.

I don't understand the rest of the clue.

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(Other definitions for lorelei that I've seen before include "Legendary siren who lured Rhine boatmen to destruction" , "Fateful singer" , "Rhine Rock where sirens once dwelled" , "Legendary siren luring Rhine boatmen to destruction" , "A Rhine maiden" .)

I've seen this clue in the Evening Standard.
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