Aquarium specimen of major ferocity? (4)
I believe the answer is:
orfe
'aquarium specimen' is the definition.
The definition suggests a singular noun which matches the answer.
'of major ferocity?' is the wordplay.
'of' indicates the answer is hidden within the clue.
'ORFE' is hidden in the letters of 'major ferocity'.
Can you help me to learn more?
(Other definitions for orfe that I've seen before include "Fish of carp family; rhymes with quayside" , "swimmer" , "Silvery freshwater fish of carp family" .)