The most common and most likely answer to this crossword clue is the 6 letter word PUTSCH
I've seen this crossword clue in The Times
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More clues leading to the result PUTSCH
- A coup, getting school place first
- Places echo after shell goes off in coup
- Revolutionary measure imposed on school
- Regime change in places with extremes of temperature
- Express’s quiet about Conservative power grab
- Church submits before uprising
- Revolt when school place is switched
- Planned coup may see place needed before school
- England exiting the cup’s terrible shock to the system?
- Coup as Manx cat brought about end of rat before church
Buddy explains!

The straight part
We know that "A coup" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a coup = putsch.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 PUTSCH mean?
PUTSCH noun- A coup d'état; an illegal effort to forcibly overthrow the current government.