Cryptic crossword clue
One observes holy group keeping quiet on a hill 9

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

I've seen this crossword clue in The Daily Telegraph
S
P
E
C
T
A
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R


Buddy explains!

The straight part
We know that "One observes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one observes = spectator.
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 SPECTATOR mean?

SPECTATOR noun
  1. One who watches an event; especially, one held outdoors.

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