Large part of Canada that may accommodate European country (5)
I believe the answer is:
yukon
This could be a double definition.
'large part' is the first definition.
'yukon' can be an answer for 'part' (I have seen 'part of Canada' mean 'yukon' so perhaps 'part' could also mean 'yukon'). I am not certain of the 'large' bit.
'of canada that may accommodate european country' is the second definition.
'yukon' can be an answer for 'of canada' (I've seen this before). I am not certain of the remainder of the definition.
Can you help me to learn more?
(Other definitions for yukon that I've seen before include "Canadian territory adjoining Alaska" , "River of northwest US and Canada" , "Klondike area" , "Site of the Canadian gold rush of the 1890s" , "North American banker" .)