It's out of the ordinary for a foreign conformist (10)
I believe the answer is:
unorthodox
'it's out' is the definition.
(thesaurus)
'a foreign conformist' is the wordplay.
'a foreign' becomes 'un' ('a' translated into French).
'conformist' becomes 'orthodox' ('orthodox' can be similar in meaning to 'conformist').
'un'+'orthodox'='UNORTHODOX'
'of the ordinary for' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for unorthodox that I've seen before include "Not conventional" , "Indifferent response" , "Irregular" , "Contrary to what is usual" .)