Fish eater tucked into mirror carp (4)

I believe the answer is:

orca

'fish eater' is the definition.
(orcas eat fish)

'tucked into mirror carp' is the wordplay.
'tucked into' indicates the answer is hidden within the clue.
'ORCA' is hidden within 'mirror carp'.

(Other definitions for orca that I've seen before include "Killer-whale" , "Danger for swimmers" , "Killer at sea" , "grampus" , "Massive killer" .)

I've seen this clue in The Telegraph.

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