Plaster vinaigrette? (8)
I believe the answer is:
dressing
This clue is a double definition.
'plaster' is the first definition.
(thesaurus)
'vinaigrette?' is the second definition.
(vinaigrette is a kind of dressing)
(Other definitions for dressing that I've seen before include "Bandage, plaster" , "Condiment" , "clothing" , "Sauce - alignment - bandage" , "Sauce for salad etc" .)