The most common and most likely answer to this crossword clue is the 5 plus 7 plus 8 letter word PLAIN ENGLISH CAMPAIGN
I've seen this crossword clue in The Guardian
P
L
A
I
N
E
N
G
L
I
S
H
C
A
M
P
A
I
G
N
Buddy explains!
The straight part
We know that "people asking for its clarity? (" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case people asking for its clarity? ( = plain english campaign.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.