Queen overcome by a Labor leader in speech (6)

I believe the answer is:

salmon

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

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for salmon that I've seen before include "Game fish" , "Sockeye, for example" , "See 3" , "Oft tinned fish" , "high-jumper" .)

I've seen this clue in the Sydney Morning Herald.

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