The most common and most likely answer to this crossword clue is the 8 letter word CHARTISM
I've seen this crossword clue in The Daily Telegraph
C
H
A
R
T
I
S
M
More clues leading to the result CHARTISM
- Talk about King — is male in reform movement?
- Reform movement has endless magnetism – time to get stuck in
- Reform movement has endless sort of magnetism — time to get stuck in
- Appeal put around to have meeting about campaign for social reform
- Glamour surrounds revolutionary model’s movement popular with workers
Buddy explains!

The straight part
We know that "movement popular with workers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case movement popular with workers = chartism.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 CHARTISM mean?
CHARTISM noun- The practices and methodologies of chartists.