A little bit of discretion (5)
I believe the answer is:
taste
I believe this is a triple definition!
'a little' is the first definition.
(thesaurus)
'bit' is the second definition.
(I have seen 'A bit' mean 'taste' so perhaps 'bit' could also mean 'taste')
'of' acts as a link.
'discretion' is the third definition.
(I've seen this in another clue)
(Other definitions for taste that I've seen before include "Sensation of flavour" , "Sample orally" , "Sample by eating or drinking a little" , "Delicacy" , "To eat sparingly" .)