Method learnt differently in North American city (8)
I believe the answer is:
montreal
'north american city' is the definition.
(city in Canada)
'method learnt differently in' is the wordplay.
'method' becomes 'mo' (modus operandi, a particular method).
'differently' indicates anagramming the letters.
'in' means one lot of letters goes inside another.
'learnt' anagrammed gives 'ntreal'.
'mo' put within 'ntreal' is 'MONTREAL'.
(Other definitions for montreal that I've seen before include "Let Norma go to the city" , "Largest city of Quebec" , "Canada's largest city, port on St Lawrence river" , "Let Norma go to Canada" , "somewhere abroad" .)