Crossword Genius

During seminar, whale is marine creature (7)

Ross

I believe the answer is:

narwhal

I'm a little stuck... Click here to teach me more about this clue!

'marine creature' is the definition.
The definition and answer can be both animals as well as being singular nouns.
Maybe there's an association between them I don't understand?

'during seminar whale is' is the wordplay.
'during' indicates a hidden word.
'NARWHAL' can be found hidden inside 'seminar whale is'.

Can you help me to learn more?

(Other definitions for narwhal that I've seen before include "swimmer" , "Animal with large spiral tusk" , "Sea creature with a long spiral tusk" , "Warn Hal there's a whale here" , "Small Arctic whale" .)

I've seen this clue in The Daily Express.
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