Listen out for embellishment (6)
I believe the answer is:
tinsel
'for embellishment' is the definition.
(thesaurus)
'listen out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'listen' is an anagram of 'TINSEL'.
(Other definitions for tinsel that I've seen before include "Christmas tree decoration" , "Glittering Christmas strip" , "Glittering metal foil strip" , "Christmas decorations" , "Christmas foil" .)