Foreign mate advanced with vim on M1 (5)
I believe the answer is:
amigo
'foreign mate' is the definition.
'amigo' can be an answer for 'mate' (I've seen this in another clue). I'm not sure about the 'foreign' bit.
'advanced with vim on m1' is the wordplay.
'advanced' becomes 'a'.
'with' is a charade indicator (letters next to each other).
'vim' becomes 'go' (I can't explain this - if you can you should give a lot more credence to this answer).
'on' means one lot of letters go next to another.
'mg' becomes 'mi' (resembles Mg).
'go' after 'mi' is 'migo'.
'a'+'migo' is 'AMIGO'.
Can you help me to learn more?
(Other definitions for amigo that I've seen before include "Male (Spanish?) friend" , "Foreign ally" , "Friend in Spanish-speaking areas" , "Spanish word meaning friend" , "A Spanish pal" .)