Cryptic crossword clue
Fails to protect single clergyman from Guides 11

The most common and most likely answer to this crossword clue is the 11 letter word DIRECTORIES

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

Buddy explains!

The straight part
We know that "Guides" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case guides = directories.
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.

Crossword Answer definitions

DIRECTORIES noun
  1. A list of names, addresses etc, of specific classes of people or organizations, often in alphabetical order or in some classification.
  2. A structured listing of the names and characteristics of the files on a storage device.
  3. A virtual container in a computer's file system, in which files and other directories may be stored. The files and subdirectories in a directory are usually related.

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