Cryptic crossword clue
Arrogant, having an IQ of 150? 3,6,2,4

The most common and most likely answer to this crossword clue is the 18 letter word TOO CLEVER BY HALF

I've seen this crossword clue in The Guardian
T
O
O
Â
 
C
L
E
V
E
R
Â
 
B
Y
Â
 
H
A
L
F

Buddy explains!

The straight part
We know that "Arrogant" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case arrogant = too clever by half.
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.

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