North American city also welcoming leader of revolution, not surprisingly (7)
I believe the answer is:
toronto
'north american city' is the definition.
(I've seen this before)
'also welcoming leader of revolution not surprisingly' is the wordplay.
'also' becomes 'too' (synonyms).
'welcoming' means one lot of letters goes inside another (in sense of 'inviting in').
'leader of' indicates taking the first letters.
'surprisingly' indicates an anagram (a surprising ordering of the letters).
The initial letter of 'revolution' is 'r'.
'r'+'not'='rnot'
'rnot' is an anagram of 'ront'.
'too' going around 'ront' is 'TORONTO'.
(Other definitions for toronto that I've seen before include "Canadian city" , "place on Lake Ontario" , "Ontarian capital" , "Transatlantic city" , "Second city of Canada" .)