Brilliance in manipulation of result (6)
I believe the answer is:
lustre
'brilliance' is the definition.
(I've seen this before)
'manipulation of result' is the wordplay.
'manipulation of' indicates anagramming the letters (I've seen this in other clues).
'result' is an anagram of 'LUSTRE'.
'in' is the link.
(Other definitions for lustre that I've seen before include "Sheen or renown" , "Result (anag) -- gloss" , "Rustle with shine on surface" , "Distinction < in five years" , "Soft brightness or glory" .)