What's used to dress model given attire (11)
I believe the answer is:
vinaigrette
'what's used to dress' is the definition.
(salad dressing)
'model given attire' is the wordplay.
'model' indicates anagramming the letters.
'given'+'attire'='givenattire'
'givenattire' is an anagram of 'VINAIGRETTE'.
(Other definitions for vinaigrette that I've seen before include "French dressing" , "that will be put on the table in France" , "sharp dressing" , "Salad dressing" .)