Metalwork in posh bathroom around dressing room (6)
I believe the answer is:
ormolu
'metalwork' is the definition.
(I've seen this before)
'posh bathroom around dressing room' is the wordplay.
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-u).
'bathroom' becomes 'loo' (loo is a kind of bathroom**).
'around' says the letters should be written backwards.
'dressing' indicates putting letters inside (a dressing is a kind of covering).
'room' becomes 'rm' (I've seen this in other clues).
'u'+'loo'='uloo'
'uloo' in reverse letter order is 'oolu'.
'oolu' enclosing 'rm' is 'ORMOLU'.
'in' acts as a link.
(Other definitions for ormolu that I've seen before include "Gilt brass" , "Alloy of copper and zinc" , "Gold-coloured alloy used to decorate furniture" , "Decorative gilt alloy" , "Furniture-decorating alloy" .)