Come in the main front gate, or always at the back (5)
I believe the answer is:
enter
'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" .)