Dislike test said to be fixed (8)
I believe the answer is:
distaste
'dislike' is the definition.
(I know that distaste is a type of dislike)
'test said to be fixed' is the wordplay.
'to be fixed' indicates anagramming the letters.
'test'+'said'='testsaid'
'testsaid' anagrammed gives 'DISTASTE'.
(Other definitions for distaste that I've seen before include "Abhorrence" , "Feeling of dislike or aversion" , "Antipathy, aversion" , "Repugnance" , "Loathing" .)