Nurse got boiled fish (8)
I believe the answer is:
sturgeon
'fish' is the definition.
(sturgeon is a kind of fish)
'nurse got boiled' is the wordplay.
'boiled' is an anagram indicator.
'nurse'+'got'='nursegot'
'nursegot' anagrammed gives 'STURGEON'.
(Other definitions for sturgeon that I've seen before include "So urgent to find caviar-bearing fish" , "Source of caviar" , "So urgent to find caviare-bearing fish" , "Egg producer" , "Fish that yields caviare" .)