Foreign friend in past crossing M1 (5)
I believe the answer is:
amigo
'foreign friend' is the definition.
(I've seen this before)
'past crossing m1' is the wordplay.
'past' becomes 'ago' (similar in meaning).
'crossing' indicates putting letters inside.
'm1' becomes 'mi' (resembles M1).
'ago' going around 'mi' is 'AMIGO'.
'in' acts as a link.
(Other definitions for amigo that I've seen before include "friend abroad" , "Hispanic friend" , "A Spanish pal" , "friend in Uruguay" , "China (in Spain's view)" .)