Friend takes a turn round motorway (5)
I believe the answer is:
amigo
'friend' is the definition.
(thesaurus)
'a turn round motorway' is the wordplay.
'turn' becomes 'go' (a person's move in a board game**).
'round' indicates putting letters inside.
'motorway' becomes 'mi' (resembles Mg, English motorway).
'a'+'go'='ago'
'ago' enclosing 'mi' is 'AMIGO'.
'takes' acts as a link.
(Other definitions for amigo that I've seen before include "A Spanish pal" , "in a foreign land, my friend?" , "buddy abroad?" , "Friend in Spanish-speaking area" , "friend abroad" .)