Try to have discrimination (5)
I believe the answer is:
taste
This clue is a triple definition!
'try' is the first definition.
(synonyms)
'to have' is the second definition.
(tasting is a kind of having)
'discrimination' is the third definition.
(taste is a kind of discrimination)
(Other definitions for taste that I've seen before include "Liking (for)" , "The ability to discern good quality" , "Small portion" , "Sample the flavour" , "Show sense" .)