Crossword Genius

Be an outsider no longer (5)

Ross

I believe the answer is:

enter

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'be' is the definition.
(entering is a kind of being)

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

Can you help me to learn more?

(Other definitions for enter that I've seen before include "Come in - penetrate - record" , "Get in" , "Enroll, sign up" , "Go in - set down" , "Inscribe" .)

I've seen this clue in the Evening Standard.
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