At weekend, wearing shiny fabric (5)
I believe the answer is:
satin
'shiny fabric' is the definition.
(I've seen this before)
'at weekend wearing' is the wordplay.
'at weekend' becomes 'sat' (I can't justify this - if you can you should give a lot more credence to this answer).
'wearing' becomes 'in' (in certain clothing).
'sat'+'in'='SATIN'
Can you help me to learn more?
(Other definitions for satin that I've seen before include "Rich cloth" , "Smooth and silky" , "Glossy textile" , "Silk fabric" , "Stain on shiny fabric" .)