Pure, natural duet moving journalist (13)
I believe the answer is:
unadulterated
'pure' is the definition.
(I've seen this before)
'natural duet moving journalist' is the wordplay.
'moving' indicates an anagram.
'journalist' becomes 'ed' (short for editor).
'natural'+'duet'='naturalduet'
'naturalduet' is an anagram of 'unadulterat'.
'unadulterat'+'ed'='UNADULTERATED'
(Other definitions for unadulterated that I've seen before include "not cut" , "Pure" , "Simple" , "Total" .)