The most common and most likely answer to this crossword clue is the 7 letter word ALRIGHT
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Buddy explains!

The straight part
We know that "acceptable" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case acceptable = alright.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 ALRIGHT mean?
ALRIGHT adjective- Good; in acceptable, if not excellent condition.
- In good health, unharmed.
- Used to indicate acknowledgement or acceptance; OK.
- A generic greeting; hello; how are you.