Road's total cost (12)

I believe the answer is:

thoroughfare

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'road's' is the definition.
(thoroughfare is a kind of road)

'total cost' is the wordplay.
'total' becomes 'thorough' (I am not sure about this - if you are sure you should believe this answer much more).
'cost' becomes 'fare' (fare is a kind of cost).
'thorough'+'fare'='THOROUGHFARE'

Can you help me to learn more?

(Other definitions for thoroughfare that I've seen before include "highway" , "Road or path" , "Access - road" , "Main road" , "Public road" .)

I've seen this clue in The Telegraph.

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