A minor thoroughfare in Europe, say (6)
I believe the answer is:
abroad
'in europe say' is the definition.
(I've seen this in another clue)
'a minor thoroughfare' is the wordplay.
'minor thoroughfare' becomes 'B road' (B road).
'a'+'broad'='ABROAD'
(Other definitions for abroad that I've seen before include "Away from home" , "in France, say" , "In another country, not at home" , "At large; widely current" , "out of UK?" .)