The most common and most likely answer to this crossword clue is the 5 letter word NEGUS
I've seen this crossword clue in Financial Times
N
E
G
U
S
More clues leading to the result NEGUS
- Students gathering for one drink
- Drink that’s good found in New England area?
- Old drink tipped back into tiramisu, generously
- Spiced drink, say, drunk by setter, not going down
- Students gathering for one hot tipple
- Drink and dope upset you and me
- Hot drink, drop of espresso in refurbished snug
- Hot port drink, say, consumed by rising star
- Hot drink, say, absorbed by revolutionary rag
- TV antiquarian with English artillery, name uppermost
Buddy explains!

The straight part
We know that "Old drink" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case old drink = negus.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.
What does NEGUS mean?
NEGUS noun- A drink of wine, lemon, sugar, nutmeg and hot water.
- A ruler of Ethiopia or of a province of Ethiopia; specifically, the supreme ruler of Ethiopia before 1974.