The most common and most likely answer to this crossword clue is the 8 letter word ADEQUATE
I've seen this crossword clue in Independent
A
D
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Q
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More clues leading to the result ADEQUATE
- Satisfactory to correspond with Bill
- Acceptable area and time to digest European question
- Just about enough pre-match publicity?
- Promo: ‘Bracket is tolerable!’
- Present time allocated to match is satisfactory
- Sufficient notice before match
- One day with English queen swilling tea’s enough
- Decent English queen caught in a tryst
- Fair enough!
- Cockney was required to make uniform of acceptable quality
Buddy explains!

The straight part
We know that "Fair/enough" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fair/enough = adequate.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 ADEQUATE mean?
ADEQUATE verb- To equalize; to make adequate.
- To equal.
- Equal to or fulfilling some requirement.