Cryptic crossword clue
Most moralistic member of clergy interrupted by a head 10

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

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

The straight part
We know that "Most moralistic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case most moralistic = preachiest.
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 PREACHIEST mean?

PREACHIEST adjective
  1. Tending toward excessive moralization.

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