Cryptic crossword clue
Turned up without performing piece of mine 9

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

I've seen this crossword clue in The Sunday Telegraph
D
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T
O
N
A
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Buddy explains!

The straight part
We know that "piece of mine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case piece of mine = detonator.
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 DETONATOR mean?

DETONATOR noun
  1. A device used to detonate an explosive device etc.
  2. A small explosive device attached to the railhead to provide an audible warning when a train passes over it.
  3. Any explosive whose action is practically instantaneous.
  4. A gun fired by a percussion cap.

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