Odd lustre is consequence (6)
I believe the answer is:
result
'consequence' is the definition.
('result' can be a synonym of 'consequence')
'odd lustre' is the wordplay.
'odd' indicates an anagram.
'lustre' anagrammed gives 'RESULT'.
'is' acts as a link.
(Other definitions for result that I've seen before include "Final score" , "Consequence in Ulster (6)" , "Effect of lustre" , "Final outcome" , "Rustle (anag.)" .)