Poor duet set it off (9)
I believe the answer is:
destitute
'poor' is the definition.
(similar in meaning)
'duet set it off' is the wordplay.
'off' indicates an anagram.
'duet'+'set'+'it'='duetsetit'
'duetsetit' is an anagram of 'DESTITUTE'.
(Other definitions for destitute that I've seen before include "Absolutely broke, without money or goods" , "Totally impoverished" , "Penniless, without the necessities of life" , "Poverty-stricken" , "Impoverished, indigent" .)