The most common and most likely answer to this crossword clue is the 5 plus 5 letter word SPLIT HAIRS
I've seen this crossword clue in The Times
S
P
L
I
T
H
A
I
R
S
More clues leading to the result SPLIT HAIRS
- Fault unreasonably found in chair sometimes
- Find problems with this spiral fracture
- Croatian boxers reportedly bringing carp
- Quibble about abandoning Paris Hilton’s broadcast
- Quibble about trifles that results in parting?
- Argue about details of parish list to be circulated
- Argue about fine distinctions in, say, mammals from Adriatic city
- Argue about tiny details in Dalmatian city locks
- Make fine distinctions composing parish list
- Be persnickety, altering ship’s trail
Buddy explains!
The straight part
We know that "Fault unreasonably" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fault unreasonably = split hairs.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.