Modelled wearing shiny fabric (5)
I believe the answer is:
satin
'shiny fabric' is the definition.
(I've seen this before)
'modelled wearing' is the wordplay.
'modelled' becomes 'sat' ('sit' can be a synonym of 'model').
'wearing' becomes 'in' (you are 'in' the clothes you're wearing).
'sat'+'in'='SATIN'
(Other definitions for satin that I've seen before include "Smooth and silky" , "Stain on silky cloth" , "Lustrous fabric" , "Saint (anag.)" , "covered with?" .)