Meddle, as some Canadian leader? (7)
I believe the answer is:
intrude
'meddle' is the definition.
(I've seen this in another clue)
'as some canadian leader?' is the wordplay.
'as' becomes 'in' (I've seen this in other clues).
'some canadian leader?' becomes 'trude' (I can't explain this - if you can you should give a lot more credence to this answer).
'in'+'trude'='INTRUDE'
(Other definitions for intrude that I've seen before include "Push in where not wanted" , "Poke one's nose in" , "Break in" , "Push in uninvited" , "Come in when not wanted" .)