The most common and most likely answer to this crossword clue is the 4 letter word BEER
B
E
E
R
More clues leading to the result BEER
- Resort in South Devon to drink
- Worker at first refuses drink
- Ale better avoided by teetotaller
- Social worker runs for a drink in the pub
- Busy worker recoils at first drink
- Junior Scout putting away a very alcoholic drink
- Worker perhaps rejoices at first pint
- Worker gets king a drink
- Perhaps bitter, bishop visits eastern monarch
- Alcoholic drink preferable, not teetotal
Buddy explains!

The straight part
We know that "a drink in the pub" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a drink in the pub = beer.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 BEER mean?
BEER noun- An alcoholic drink fermented from starch material, commonly barley malt, often with hops or some other substance to impart a bitter flavor.
- A fermented extract of the roots and other parts of various plants, as spruce, ginger, sassafras, etc.
- A solution produced by steeping plant materials in water or another fluid.
- A glass, bottle, or can of any of the above beverages.
- A variety of the above beverages.
- To give beer to (someone)
- One who is or exists.