Cryptic crossword clue
Musical noteoften posed by web site visitors quarter-second

The most common and most likely answer to this crossword clue is the 4 letter word FAQS

I've seen this crossword clue in The Guardian
F
A
Q
S

Buddy explains!

The straight part
We know that "often posed by web site visitors" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case often posed by web site visitors = faqs.
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 FAQS mean?

FAQS noun
  1. A list of questions said to be frequently asked, and their answers.

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