Breaking cover Greek character wheels round inside entrance (7)
I believe the answer is:
gateway
'entrance' is the definition.
(I know that gateway is a type of entrance)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for gateway that I've seen before include "Yet a wag, strangely, could provide an entrance" , "Closable opening" , "Connection between two networks" , "Connection between computer networks" , "Means of access" .)