Cryptic crossword clue
Dismissal of cop — canteen can go wild 3-10

The most common and most likely answer to this crossword clue is the 13 letter word NONACCEPTANCE

I've seen this crossword clue in The Guardian
N
O
N
A
C
C
E
P
T
A
N
C
E

Buddy explains!

The straight part
We know that "Dismissal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dismissal = nonacceptance.
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 NONACCEPTANCE mean?

NONACCEPTANCE noun
  1. A neglect or refusal to accept.

Latest crossword clues with full explanations