Sea creature managed to surface with truncated sound (7)
I believe the answer is:
narwhal
'sea creature' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for narwhal that I've seen before include "Small Arctic whale" , "aquatic mammal" , "Tusked marine creature" , "Breed of small whale" , "Arctic whale, the male having a long spiral ivory tusk" .)