Large diver wants Spooner's Milky Bar (5,5)

I believe the answer is:

right whale

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

'large diver' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for right whale that I've seen is " large sea creature".)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.