Also suppressing corruption around Northern Canadian city (7)
I believe the answer is:
toronto
'canadian city' is the definition.
(I've seen this before)
'also suppressing corruption around northern' is the wordplay.
'also' becomes 'too' ('too' can be a synonym of 'also').
'suppressing' indicates putting letters inside.
'corruption' becomes 'rot' (I've seen this before**).
'around' means one lot of letters goes inside another.
'northern' becomes 'n' (abbreviation e.g. N. Ireland).
'rot' placed around 'n' is 'ront'.
'too' placed around 'ront' is 'TORONTO'.
(Other definitions for toronto that I've seen before include "place on Lake Ontario" , "Provincial capital" , "Largest city in Canada" , "Capital city of Ontario" , "Transatlantic city" .)