Drink that went to one’s head once? (8)
I believe the answer is:
nightcap
I believe this clue is a double definition.
'drink' is the first definition.
(I have seen 'Late drink ' mean 'nightcap' so perhaps 'drink' could also mean 'nightcap')
'that went to one's head once?' is the second definition.
(old-fashioned headwear worn at night)
(Other definitions for nightcap that I've seen before include "Bedtime beverage" , "Last drink before bed" , "Head covering" , "A drink before sleep" , "late evening beverage" .)