Satiny, long revealing stocking (5)
I believe the answer is:
nylon
'stocking' is the definition.
(nylon stocking is a kind of stocking)
'satiny long revealing' is the wordplay.
'revealing' indicates the answer is hidden within the clue.
'NYLON' can be found hidden inside 'satiny long'.
(Other definitions for nylon that I've seen before include "Artificial fabric" , "where ladder can appear?" , "Artificial yarn/fabric" , "Fabric (originally from New York and London)" , "Polyamide" .)