Crossword Genius

Top off stone entrance (4)

Ross

I believe the answer is:

gate

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'entrance' is the definition.
(type of entrance)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for gate that I've seen before include "Entrance (money)" , "Kind of door as in wall or fence" , "Field entrance" , "Plane-boarding point" , "Portal" .)

I've seen this clue in The Daily Mail.
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