The most common and most likely answer to this crossword clue is the 3 plus 3 plus 5 letter word GIN AND TONIC
I've seen this crossword clue in Independent
G
I
N
A
N
D
T
O
N
I
C
More clues leading to the result GIN AND TONIC
- Jar containing drunkard’s ultimate drink
- ar containing dipso’s first drink
- Drink primarily containing rum – that’s not it!
- Drink containing bubbly? Duke tucked in
- What one gets when noticing mixed drink
- Drink from greasiest lips?
- Cocktail mix containing bit of Drambuie
- Cook not dining without a cold drink
- Drink: good inn can do it on the rocks
Buddy explains!

The straight part
We know that "drink" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drink = gin and tonic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.