Crossword Genius

Crossing by way of tube (7)

Ross

I believe the answer is:

viaduct

'crossing' is the definition.
(thesaurus)

'by way of tube' is the wordplay.
'by way of' becomes 'via' (I've seen this before).
'tube' becomes 'duct' (I've seen this before).
'via'+'duct'='VIADUCT'

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

I've seen this clue in The Sun.
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