Cryptic crossword clue
A bad thing to do in Spain is idiotic 7

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

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

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

ASININE adjective
  1. Very foolish; failing to exercise intelligence or judgement or rationality
  2. Of, pertaining to, or characteristic of donkeys

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