Cryptic crossword clue
Responsible, short advert written up in message 8

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

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

The straight part
We know that "Responsible" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case responsible = culpable.
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 CULPABLE mean?

CULPABLE adjective
  1. Meriting condemnation, censure or blame, especially as something wrong, harmful or injurious; blameworthy.

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