Cryptic crossword clue
Narrow opening is piercing rocky fault 7

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

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Buddy explains!

The straight part
We know that "Narrow opening" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case narrow opening = fistula.
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 FISTULA mean?

FISTULA noun
  1. An abnormal connection or passageway between organs or vessels that normally do not connect.
  2. A tube, a pipe, or a hole.
  3. The tube through which the wine of the Eucharist was once sucked from the chalice.

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