The most common and most likely answer to this crossword clue is the 6 letter word KOSHER
I've seen this crossword clue in The Guardian
K
O
S
H
E
R
More clues leading to the result KOSHER
- Being properly prepared puts the girl out
- What’s acceptable floors that woman
- Genuine stunner’s quite heartless
- Genuine punch mum finishes in one hour
- Meeting dietary requirements knocks the woman out
- Knight on horse, battling for right
- Permissible or all right to retreat facing a lion
- Wins a women's boxing match within the rules
Buddy explains!

The straight part
We know that "What’s acceptable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case what’s acceptable = kosher.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 KOSHER mean?
KOSHER verb- To kasher; to prepare (for example, meat) in conformity with the requirements of the Jewish law.
- Fit for use or consumption, in accordance with Jewish law (especially relating to food).
- (by extension) In accordance with standards or usual practice.
- In a kosher manner; in accordance with kashrut.