Liking decorum (5)
I believe the answer is:
taste
I believe this clue is a double definition.
'liking' is the first definition.
(taste is a kind of liking)
'decorum' is the second definition.
(I've seen this before)
(Other definitions for taste that I've seen before include "Sip" , "to eat in small amounts" , "Partake of" , "Sensation in the mouth caused by food" , "Impression from food" .)