Cryptic crossword clue
Protective part of parapet, thick round centre of course 7

The most common and most likely answer to this crossword clue is the 7 letter word SURTOUT

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Buddy explains!

The straight part
We know that "Protective part of parapet" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case protective part of parapet = surtout.
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 SURTOUT mean?

SURTOUT noun
  1. A man's overcoat; a close-bodied frock coat.
  2. (fortifications) A raised portion of the parapet of a work at the angles, to protect from enfilade fire.

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