Cryptic crossword clue
A car spares outlet may have one over a barrel! 8

The most common and most likely answer to this crossword clue is the 8 letter word SILENCER

I've seen this crossword clue in The Daily Telegraph
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Buddy explains!

The straight part
We know that "A car spares outlet may have one" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a car spares outlet may have one = silencer.
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 SILENCER mean?

SILENCER noun
  1. Something that silences.

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