Brightly coloured tropical freshwater fish such as the Neon or Cardinal (5)

I believe the answer is:

tetra

(Other definitions for tetra that I've seen before include "... Four < , in composition" , "Small brightly-coloured fish of aquariums" , "Bright fish; four (prefix)" , "Small tropical fish" , "With four parts" .)

I've seen this clue in The Mirror.

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