The most common and most likely answer to this crossword clue is the 3 plus 4 letter word SIX PACK
I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Batch of beers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case batch of beers = six pack.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 SIX PACK mean?
SIX PACK noun- A collection of six of something bundled together, especially six cans.
- A highly developed set of abdominal muscles.