Crossword Genius

It may not be plain where this route goes (8)

Ross

I believe the answer is:

highroad

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

'it may not be plain where this route goes' is the definition.
'highroad' can be an answer for 'route' (highroad is a kind of route). I'm unsure of the remainder of the definition.

'route goes' is the wordplay.
I cannot quite see how this works, but
'route' could be 'road' (synonyms) and 'road' is located in the answer.
The remaining letters 'high' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for highroad that I've seen is " Upper route?".)

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