Cryptic crossword clue
Official authorising unusually direct note in suit 13

The most common and most likely answer to this crossword clue is the 13 letter word ACCREDITATION

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

The straight part
We know that "Official authorising" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case official authorising = accreditation.
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.

Crossword Answer definitions

ACCREDITATION noun
  1. The giving of credentials.
  2. The act of accrediting.
  3. The granting of approval to an institution of higher learning by an official review board after the school has met certain requirements.

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