Cryptic crossword clue
Ban peace cult out of hand? It’s not on! 12

The most common and most likely answer to this crossword clue is the 12 letter word UNACCEPTABLE

I've seen this crossword clue in The Daily Telegraph
U
N
A
C
C
E
P
T
A
B
L
E

Buddy explains!

The straight part
We know that "not on" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not on = unacceptable.
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 UNACCEPTABLE mean?

UNACCEPTABLE noun
  1. Something that is not acceptable.
UNACCEPTABLE adjective
  1. Unsatisfactory; not acceptable
  2. Not conforming to accepted usage

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