Sure way to take a morally superior approach? (8)

I believe the answer is:

highroad

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

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

'sure way' is the wordplay.
'sure' becomes 'high' (I am not sure about this - if you are sure you should believe this answer much more).
'way' becomes 'road' (road is a kind of way).
'high'+'road'='HIGHROAD'

'to take' acts as a link.

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 Irish Times.

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