Monster opposite Charybdis (6)

I believe the answer is:

scylla

(Other definitions for scylla that I've seen before include "Charybdis counterpart" , "Six-headed monster who sat on a rock opposite Charybdis" , "Peril with Charybdis" , "Legendary rock" , "danger to shipping" .)

I've seen this clue in The Times.

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