Cryptic crossword clue
Police officer, one demanding payment for engine booster 12

The most common and most likely answer to this crossword clue is the 12 letter word SUPERCHARGER

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

The straight part
We know that "engine booster" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case engine booster = supercharger.
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 SUPERCHARGER mean?

SUPERCHARGER noun
  1. An inlet air compressor for an internal combustion engine (either Otto or Diesel cycle), normally powered from the crankshaft.

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