Crossword Genius

Road up? (7)

Ross

I believe the answer is:

highway

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

'road' is the definition.
(highway is a kind of road)

'up?' is the wordplay.
I cannot quite understand how this works, but
'up?' could be 'high' (associated in meaning) and 'high' is located in the answer.
The remaining letters 'way' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for highway that I've seen before include "Major road for motor transport" , "Open road" , "Road-user's Code" , "Such robberies" , "Major route" .)

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