The most common and most likely answer to this crossword clue is the 7 plus 5 letter word WORKING CLASS
I've seen this crossword clue in The Daily Telegraph
W
O
R
K
I
N
G
C
L
A
S
S
More clues leading to the result WORKING CLASS
- Proletarian aspiration of 10?
- Those in society on form
- Apply oneself at school acquiring good C or D
- Labour group in dispute turned to top man about girl
- On form demographic group?
- Section of society running study group
- Wage-earners, for example, on form
- Pulp song, with raw licks, ‘Common People’
- Blue collar is on order
Buddy explains!

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 WORKING CLASS mean?
WORKING CLASS adjective- Of or pertaining to the working class; suggestive of the working class in manner of speaking, outlook, appearance or other qualities.