The most common and most likely answer to this crossword clue is the 8 letter word LOVELIER
I've seen this crossword clue in The Guardian
L
O
V
E
L
I
E
R
Buddy explains!

The straight part
We know that "more than fair" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more than fair = lovelier.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 LOVELIER mean?
LOVELIER adjective- Beautiful; charming; very pleasing in form, looks, tone, or manner.
- Very nice, wonderful.
- Inspiring love or friendship; amiable.
- Loving, filled with love.
- Worthy of praise.