Cryptic crossword clue
Official introductory letter client read out 10

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

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

The straight part
We know that "Official introductory letter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case official introductory letter = credential.
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 CREDENTIAL mean?

CREDENTIAL noun
  1. (chiefly in the plural) documentary or electronic evidence that a person has certain status or privileges
CREDENTIAL verb
  1. To furnish with credentials
CREDENTIAL adjective
  1. Pertaining to or serving as an introduction or recommendation (to someone).

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