Crossword Genius

Ancestor of a termite, surprisingly (5)

Ross

I believe the answer is:

roach

(Other definitions for roach that I've seen before include "Swimmer" , "Freshwatwer fish" , "Silvery freshwater fish" , "Small freshwater fish related to carp" , "Silver and red freshwater fish" .)

I've seen this clue in The New York Times.
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