Crossword Genius

Way to cross a road (7)

Ross

I believe the answer is:

viaduct

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

'cross a road' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'way to' is the wordplay.
'way' becomes 'via' (I've seen this in other clues).
'to' becomes 'duct' (I can't justify this - if you can you should believe this answer much more).
'via'+'duct'='VIADUCT'

Can you help me to learn more?

(Other definitions for viaduct that I've seen before include "Rail bridge over valley" , "Kind of road over a road" , "Bridge carrying a road over a river or valley" , "Long arched structure" , "Bridge to carry railway over a valley" .)

I've seen this clue in The Globe and Mail.
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