Revolutionary sharing decoration (7)
I believe the answer is:
garnish
'decoration' is the definition.
(I know that garnish is a type of decoration)
'revolutionary sharing' is the wordplay.
'revolutionary' indicates an anagram.
'sharing' with letters rearranged gives 'GARNISH'.
(Other definitions for garnish that I've seen before include "Dress - trimmings" , "Decoration, trimming" , "Sharing (anag) - dress" , "Adornment" , "extra on plate" .)