Nurse got steamed fish (8)

I believe the answer is:

sturgeon

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'fish' is the definition.
(type of fish)

'nurse got steamed' is the wordplay.
'nurse got' anagrams to 'STURGEON'.
However, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sturgeon that I've seen before include "Fish that yields caviare" , "Source of caviar" , "Something fishy here" , "Main resident" , "supplier of delicacy" .)

I've seen this clue in The Telegraph.

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