See regulation about importing old plush stuff (6)
I believe the answer is:
velour
'plush stuff' is the definition.
(velvet-like fabric)
'see regulation about importing old' is the wordplay.
'see' becomes 'v' (Latin 'vide', used to direct a reader to a source).
'regulation' becomes 'rule' (synonyms).
'about' shows that the letters should be reversed in order.
'importing' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'rule' in reverse letter order is 'elur'.
'elur' placed around 'o' is 'elour'.
'v'+'elour'='VELOUR'
(Other definitions for velour that I've seen before include "Louvre (anag) - fabric" , "Velvet-like fabric" , "A plush-like fabric often on furniture" , "Plushlike fabric used in louver" .)