In the aquarium, less than a major feature? (4)
I believe the answer is:
orfe
'in the aquarium' is the definition.
I can't judge whether this defines the answer.
'less than a major feature?' is the wordplay.
'less' indicates the answer is hidden within the clue (the clue less some of the letters in it).
'ORFE' is hidden within 'than major feature'.
Can you help me to learn more?
(Other definitions for orfe that I've seen before include "swimmer" , "Fish of carp family; rhymes with quayside" , "Silvery freshwater fish of carp family" .)