Decorator dressing queen (9)
I believe the answer is:
plasterer
'decorator' is the definition.
(I know that plasterer is a type of decorator)
'dressing queen' is the wordplay.
'dressing' becomes 'plaster' (plaster is a type of medical dressing).
'queen' becomes 'ER' (abbreviation for Elizabeth Regina).
'plaster'+'er'='PLASTERER'
(Other definitions for plasterer that I've seen before include "One covering walls" , "may get one drunk?" , "Tradesman" , "Artisan" , "Workman who skims along" .)