Cryptic crossword clue
Religious practice, one adopted by the big guns 9

The most common and most likely answer to this crossword clue is the 9 letter word ORDINANCE

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

The straight part
We know that "Religious practice" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case religious practice = ordinance.
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 ORDINANCE mean?

ORDINANCE noun
  1. A local law
  2. An edict or decree, authoritative order.
  3. A religious practice or ritual prescribed by the church.

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