A bit of discrimination (5)
I believe the answer is:
taste
This clue is a double definition.
'a bit' is the first definition.
(I've seen this before)
'discrimination' is the second definition.
(I know that taste is a type of discrimination)
'of' is the link.
(Other definitions for taste that I've seen before include "The ability to discern good quality" , "Savour, relish" , "Sample - discrimination" , "Smack" , "Brief sample; discernment" .)