Species of fish; leader of Scotland (8)

I believe the answer is:

sturgeon

(Other definitions for sturgeon that I've seen before include "Source of caviare and isinglass" , "Fish providing isinglass" , "Fish - got nurse (anag)" , "Shark-like fish" , "So urgent to find caviare-bearing fish" .)

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

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