Multiheaded dog guarding the gates of the underworld, in myth (8)

I believe the answer is:

cerberus

(Other definitions for cerberus that I've seen before include "Three-headed guard dog" , "Underground watchdog" , "underworld guard" , "Hades gate guardian" , "Three headed guard dog of Hades" .)

I've seen this clue in The New York Times.

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