Mellowed, like wine (4)
I believe the answer is:
aged
I believe this is a double definition.
'mellowed' is the first definition.
(I've seen this in another clue)
'like wine' is the second definition.
(I've seen this in another clue)
(Other definitions for aged that I've seen before include "Time-worn" , "Advanced in years" , "Antiquated" , "Like Uncle Arly" , "way over the hill" .)