Crossword Genius

Concrete motorway doing for the country (5)

Ross

I believe the answer is:

realm

'the country' is the definition.
(I've seen this before)

'concrete motorway' is the wordplay.
'concrete' becomes 'real' (associated in meaning).
'motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'real'+'m'='REALM'

'doing for' is the link.

(Other definitions for realm that I've seen before include "Kingdom; field of interest" , "region" , "Land under a king or queen" , "King's domain" , "Area of knowledge under discussion" .)

I've seen this clue in The Independent.
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