Discrimination some reject as terrible (5)
I believe the answer is:
taste
'discrimination' is the definition.
(taste is a kind of discrimination)
'some reject as terrible' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'TASTE' can be found hidden inside 'reject as terrible'.
(Other definitions for taste that I've seen before include "Fine discernment" , "Fine perception" , "Brief experience (of something)" , "Gustatory sensation" , "to eat in small amounts" .)