The most common and most likely answer to this crossword clue is the 11 letter word EVEN-HANDED
I've seen this crossword clue in The Guardian
E
V
E
N
-
H
A
N
D
E
D
Buddy explains!
The straight part
We know that "fair" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fair = even-handed.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 EVEN-HANDED mean?
EVEN-HANDED adjective- Treating fairly.