Finish lustre off (6)
I believe the answer is:
result
'finish' is the definition.
(thesaurus)
'lustre off' is the wordplay.
'off' indicates anagramming the letters.
'lustre' anagrammed gives 'RESULT'.
(Other definitions for result that I've seen before include "Rustle (anag.)" , "Effect - outcome" , "Consequence or effect" , "Final score" , "Final outcome" .)