Somewhere in Canada, plaque becomes visible somewhat (6)
I believe the answer is:
quebec
'somewhere in canada' is the definition.
(I know that Quebec located in the administrative territorial entity Canada)
'plaque becomes visible somewhat' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'QUEBEC' can be found hidden inside 'plaque becomes visible'.
(Other definitions for quebec that I've seen before include "Province of eastern Canada and port on St Lawrence river (6)" , "French-speaking province of eastern Canada" , "Canadian city and province, French-speaking" , "Fr.-Canadian province" , "Canadian province/city" .)