Dressed or nude and natural (9)
I believe the answer is:
unadorned
'natural' is the definition.
(thesaurus)
'dressed or nude and' is the wordplay.
'dressed' indicates an anagram ('dress' can mean 'prepare').
'or'+'nude'+'and'='ornudeand'
'ornudeand' is an anagram of 'UNADORNED'.
(Other definitions for unadorned that I've seen before include "Simple and plain as around den" , "Without embellishment" , "Plain, undecorated" , "Not decorated, plain and simple" .)