Three-headed dog in Greek mythology (8)

I believe the answer is:

cerberus

(Other definitions for cerberus that I've seen before include "Hades gate guardian" , "Mythical three-headed watchdog guarding Hades" , "Guardian dog of Hades" , "Mythical three-headed dog that guarded Hades" , "Three headed guard dog of Hades" .)

I've seen this clue in the Sydney Morning Herald.

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