Crossword Genius

Chief route to Tube station (7)

Ross

I believe the answer is:

archway

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'tube station' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?

'chief route' is the wordplay.
'chief' becomes 'arch' (synonyms).
'route' becomes 'way' (way is a kind of route).
'arch'+'way'='ARCHWAY'

'to' is the link.

Can you help me to learn more?

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

I've seen this clue in The Sun.
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