Cryptic crossword clue
Upset about inspector and copper being mocked 9

The most common and most likely answer to this crossword clue is the 9 letter word RIDICULED

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Buddy explains!

The straight part
We know that "mocked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case mocked = ridiculed.
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 RIDICULED mean?

RIDICULED verb
  1. To criticize or disapprove of someone or something through scornful jocularity; to make fun of

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