Dignified person makes a cocktail after dark (6)
I believe the answer is:
knight
'dignified person' is the definition.
'knight' can be an answer for 'person' (knight is a kind of person). I'm unsure of the 'dignified' bit.
'a cocktail after dark' is the wordplay.
'a cocktail' becomes 'K' (the end letter or tail of the word 'cocktail').
'after dark' becomes 'night'.
'k'+'night'='KNIGHT'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for knight that I've seen before include "Chess piece (in shining armour?)" , "Chess piece shaped like horse's head" , "... for example, Tippett" , "Gawain?" , "Give title of 'Sir' to" .)