Crossword Genius

As a swimmer, could start to do badly! (3)

Ross

I believe the answer is:

cod

(Other definitions for cod that I've seen before include "Kid" , "A fish; a hoax (slang)" , "Large sea fish- it's a sham" , "Cash on delivery (abbr.)" , "Payment arrangement" .)

I've seen this clue in the Evening Standard.
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