Province's queen bee regularly wearing silk (6)
I believe the answer is:
quebec
'province's' is the definition.
(province of Canada)
'queen bee regularly wearing silk' is the wordplay.
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'wearing' indicates putting letters inside.
'silk' becomes 'qc'.
'queen'+'bee'='queenbee'
The alternating letters of 'queenbee' are 'uebe'.
'uebe' put into 'qc' is 'QUEBEC'.
(Other definitions for quebec that I've seen before include "French-speaking Canadian provincial capital" , "French-speaking province of eastern Canada" , "Francophone Canadian province" , "Largest province of Canada" , "Largest Canadian province" .)