Demands a dolt to consume a cocktail (4)
I believe the answer is:
asks
'demands' is the definition.
('ask' can be a synonym of 'demand')
'a dolt to consume a cocktail' is the wordplay.
'a dolt' becomes 'ass' (I've seen this in another clue).
'to consume' indicates putting letters inside.
'a cocktail' becomes 'K' (the end letter or tail of the word 'cocktail').
'ass' placed around 'k' is 'ASKS'.
(Other definitions for asks that I've seen before include "Inquires (4)" , "Demands (something of someone)" , "Puts a query" , "Poses a question" , "Questions" .)