Promotes unique en suite stores (6)
I believe the answer is:
queens
'promotes' is the definition.
(queening is a kind of promoting)
'unique en suite stores' is the wordplay.
'stores' says the answer is hidden in the clue.
'QUEENS' is hidden within 'unique en suite'.
(Other definitions for queens that I've seen before include "powerful men on board" , "[COLLEGE] < Tennis club" , "part of New York" , "Borough of New York City for monarchs" , "promotes man on board" .)