Cryptic crossword clue
High priest’s casual greeting, unusual around church 8

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

I've seen this crossword clue in The Guardian
H
I
E
R
A
R
C
H


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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 HIERARCH mean?

HIERARCH noun
  1. One who has high and controlling authority in sacred things; the chief of a sacred order.
  2. A title of bishops in their role as ordinaries (arbiters of canon law) over their respective dioceses.

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