Shine in poor result (6)
I believe the answer is:
lustre
'shine' is the definition.
(lustre is a kind of shine)
'poor result' is the wordplay.
'poor' indicates an anagram.
'result' is an anagram of 'LUSTRE'.
'in' acts as a link.
(Other definitions for lustre that I've seen before include "Glory; soft glow" , "Gentle sheen, soft glow" , "Glory, distinction" , "Reflected light, sheen" , "Distinction < in five years" .)