Cryptic crossword clue
Copper’s bringing posh Spanish banker in for questioning 7

The most common and most likely answer to this crossword clue is the 7 letter word CURIOUS

I've seen this crossword clue in Independent
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Buddy explains!

The straight part
We know that "questioning" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case questioning = curious.
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 CURIOUS mean?

CURIOUS adjective
  1. Tending to ask questions, or to want to explore or investigate; inquisitive; (with a negative connotation) nosy, prying.
  2. Caused by curiosity.
  3. Leading one to ask questions about; somewhat odd, out of the ordinary, or unusual.
  4. Careful, fastidious, particular; (specifically) demanding a high standard of excellence, difficult to satisfy.
  5. Carefully or artfully constructed; made with great elegance or skill.

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