Crossword Genius

Come in the main front gate, or always at the back (5)

Ross

I believe the answer is:

enter

I'm a little stuck... Click here to teach me more about this clue!

'come in' is the definition.
(I know that come in can be written as enter)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for enter that I've seen before include "Get in" , "Infiltrate" , "Inscribe" , "Set foot in" , "Go in - set down" .)

I've seen this clue in The Times.
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