Malay garment, number wrapped round middle of wearer (6)
I believe the answer is:
sarong
'malay garment' is the definition.
(I've seen this before)
'number wrapped round middle of wearer' is the wordplay.
'number' becomes 'song' (I've seen this in another clue).
'wrapped round' means one lot of letters goes inside another.
'middle of' says to take the centre.
The middle letters of 'wearer' are 'ar'.
'song' going around 'ar' is 'SARONG'.
(Other definitions for sarong that I've seen before include "Malay cloth" , "Wrapped dress or skirt" , "Tropical skirt" , "Malay skirt" , "Long Eastern garment" .)