Impression Brummie had drink? No time! (4)
I believe the answer is:
idea
'impression' is the definition.
(I've seen this before)
'brummie had drink? no time' is the wordplay.
I cannot really see how this works, but
'brummie' could be 'i' (where the crossword setter is 'Brummie') and 'i' is found within the answer.
'had' could be 'd' (I've seen this in other clues) and 'd' is located in the answer.
The remaining letters 'ea' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
(Other definitions for idea that I've seen before include "Plan" , "A suspicion of" , "It comes to mind" , "Thought, belief" , "Intention" .)