Cryptic crossword clue
Instrument to summon top cops without hesitation 9

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

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Buddy explains!

The straight part
We know that "Instrument" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instrument = callipers.
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 CALLIPERS mean?

CALLIPERS noun
  1. A device used to measure thickness between two surfaces, especially for small or precise measurements.
  2. A metal (orthopedic) leg support.

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