Cryptic crossword clue
Directory left by humble attendant inside certainly 6,5

The most common and most likely answer to this crossword clue is the 6 plus 5 letter word YELLOW PAGES

I've seen this crossword clue in Independent
Y
E
L
L
O
W
P
A
G
E
S

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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.

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