Region back in Canada is accessible (4)
I believe the answer is:
asia
'region' is the definition.
(Asia is a continent)
'back in canada is accessible' is the wordplay.
'back' says the letters should be written backwards.
'in' indicates a hidden word.
'aisa' can be found hidden inside 'canada is accessible'.
'aisa' written backwards gives 'ASIA'.
(Other definitions for asia that I've seen before include "A great deal of land" , "Continental land mass" , "Tigers found here" , "Populous continent" , "The nations of the East, collectively" .)