Killer whale (4)
'killer whale' is the definition.
(synonyms)
This is all the clue.
(Other definitions for orca that I've seen before include "Sea creature" , "Large mammal" , "ship" , "Killer in deep" , "Marine creature" .)
'killer whale' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for grampus that I've seen before include "Good synchronised swimmer" , "huge creature" , "Popular name for a killer whale" , "danger in the main" , "Dolphin - killer whale" .)