Crossword Genius

Go into chippy, if fish goes first (5)

Ross

I believe the answer is:

enter

'go into' is the definition.
(enter can mean to go into a place)

I don't understand how the rest of the clue works.

(Other definitions for enter that I've seen before include "Make a record of" , "A key on the right" , "Go in - set down" , "Come in - penetrate - record" , "Register (as a competitor)" .)

I've seen this clue in The Guardian.
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