Theatre blamed for showing up Canadian province (7)
I believe the answer is:
alberta
'canadian province' is the definition.
(Alberta is an example)
'theatre blamed for showing up' is the wordplay.
'showing' says the answer is hidden in the clue (the answer is shown in the clue).
'up' is a reversal indicator (in down clue: letters go upwards).
'atrebla' can be found hidden inside 'theatre blamed for'.
'atrebla' backwards is 'ALBERTA'.
(Other definitions for alberta that I've seen before include "region of North America" , "Beat Lar up in Canada" , "part of Canada" , "Province of W. Canada" , "North American province" .)