Cryptic crossword clue
Architect built outstanding oratory primarily run by clerics 10

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

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

The straight part
We know that "run by clerics" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case run by clerics = theocratic.
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 THEOCRATIC mean?

THEOCRATIC adjective
  1. Pertaining to theocracy.
  2. (Jehovah's Witnesses) Conforming to God-rule, by Christian behavior.

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