At sea, hell's warlike predators (6,6)

I believe the answer is:

killer whales

'predators' is the definition.
(killer whales are predators)

'at sea hell's warlike' is the wordplay.
'at sea' indicates anagramming the letters.
'hells'+'warlike'='hellswarlike'
'hellswarlike' anagrammed gives 'KILLER WHALES'.

(Another definition for killer whales that I've seen is " Orcas".)

I've seen this clue in The Telegraph.

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