US soldier in blue about to take the motorway to a European country (7)
I believe the answer is:
belgium
'european country' is the definition.
(country in Europe)
'us soldier in blue about to take the motorway' is the wordplay.
'us soldier' becomes 'GI' (GI can mean an American soldier).
'in' means one lot of letters goes inside another.
'about' indicates anagramming the letters.
'to take' says to put letters next to each other.
'the motorway' becomes 'M' (as in motorway names - M1, M4 etc).
'blue' is an anagram of 'belu'.
'gi' inserted into 'belu' is 'belgiu'.
'belgiu'+'m'='BELGIUM'
'to a' acts as a link.
(Other definitions for belgium that I've seen before include "Glib emu to be found in the country" , "European nation" , "Home of EU headquarters" , "One of the Low Countries" , "Country north of France" .)