The most common and most likely answer to this crossword clue is the 8 letter word UNIONIST
I've seen this crossword clue in Independent
U
N
I
O
N
I
S
T
More clues leading to the result UNIONIST
- One might support DUP forging alliance with one’s Tory leader
- Loyal politician, one controlling working lives
- Workers’ supporter is following on in group
- Left-winger perhaps with foot swelling, heading off first
- Of a political type different to us, in NI?
- Equity, say, is beginning to trouble Belfast politician?
- Civil warmonger, possibly in situ, on manoeuvres
- 18 followed by opening act can follow trade
- Pro UK American President loses heart visiting Scottish Island
- Grant, perhaps, given by academic body is not disputed
Buddy explains!

The straight part
We know that "Workers’ supporter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case workers’ supporter = unionist.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 UNIONIST mean?
UNIONIST noun- An advocate or supporter of unionism
- A trade unionist
- (sometimes capitalised) Of or pertaining to unionism