Cryptic crossword clue
Unlawfully accessed spreadsheets he left unlocked

The most common and most likely answer to this crossword clue is the 10 letter word TRESPASSED

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

The straight part
We know that "Unlawfully accessed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unlawfully accessed = trespassed.
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 TRESPASSED mean?

TRESPASSED verb
  1. To commit an offence; to sin.
  2. To offend against, to wrong (someone).
  3. To go too far; to put someone to inconvenience by demand or importunity; to intrude.
  4. To enter someone else's property illegally.
  5. To pass beyond a limit or boundary; hence, to depart; to go.
  6. To decree that a person shall be arrested for trespassing if he or she returns to someone else's land.

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