Entrance in London (7)

I believe the answer is:

archway

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

'entrance in london' is the definition.
'archway' can be an answer for 'entrance' (archway is a kind of entrance). I'm not certain of the 'in london' bit.

'entrance in london' is the wordplay.
'entrance' becomes 'arch' (arch is a kind of entrance).
'in london' becomes 'way' (I can't justify this - if you can you should believe this answer much more).
'arch'+'way'='ARCHWAY'

Can you help me to learn more?

(Other definitions for archway that I've seen before include "Vaulted passage" , "Curved entrance" , "part of London" , "Entrance structure" , "entrance, perhaps" .)

I've seen this clue in The Irish Independent.

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