Could come to the fore as a popular aquarium fish (4)

I believe the answer is:

orfe

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'fish' is the definition.
(I've seen this before)

'could come to the fore as a popular aquarium' is the wordplay.
'fore' anagrams to 'ORFE'.
But, I am unsure how this is indicated.

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" .)

I've seen this clue in the Evening Standard.

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