Number dressing a queen in Asian garment (6)
I believe the answer is:
sarong
'asian garment' is the definition.
(type of garment)
'number dressing a queen' is the wordplay.
'number' becomes 'song' (as in a musical number).
'dressing' indicates putting letters inside (inserted letters are dressed or clad in others).
'queen' becomes 'r' (abbreviation for regina, e.g. in ER ).
'a'+'r'='ar'
'song' going around 'ar' is 'SARONG'.
'in' is the link.
(Other definitions for sarong that I've seen before include "beachwear" , "Malay cloth" , "Brightly-coloured Asian skirt" , "Groans about Malayan skirt-like garment" , "Long Eastern garment" .)