Wee drink ahead of a play (5)
I believe the answer is:
Here is my best explanation:
'play' is the definition.
('drama' can be a synonym of 'play')
'wee drink ahead of a' is the subsidiary indication.
'wee drink' becomes 'dram' (I've seen this before**).
'ahead of' means one lot of letters go next to another (I've seen this in other clues).
(Other definitions for drama that I've seen before include "Turbulent emotional episode", "Play - excitement", "Literary genre for the stage", "Exciting series of events", "Emotional situation", "Serious play", "Play, emotional series of events", "Theatrical production", "Play (as a genre)" and "Plays as a genre".)