Tune Laura composed in the buff (2,7)
I believe the answer is:
au naturel
'in the buff' is the definition.
(both can mean naked)
'tune laura composed' is the wordplay.
'composed' indicates an anagram.
'tune'+'laura'='tunelaura'
'tunelaura' is an anagram of 'AU NATUREL'.
(Other definitions for au naturel that I've seen before include "may be exposed" , "In the nude - in France" , "Very simply" , "Plain" , "Undressed (French)" .)