The most common and most likely answer to this crossword clue is the 8 letter word DOMINEER
I've seen this crossword clue in Independent
D
O
M
I
N
E
E
R
More clues leading to the result DOMINEER
- Energetic person outside pit to behave arrogantly
- One taking an active part grabbing pit boss
- Activist carrying bomb, bully
- Browbeat activist outside colliery
- Tower over action man holding explosive
- Bully — this person’s impeding performer
- Tower over pit maintained by dynamo
- Note the writer’s point, perhaps writing to
- Trick underground worker acquiring European boss
- Around pit, person keeping busy, as boss about
Buddy explains!

The straight part
We know that "bully/ (8)" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bully/ (8) = domineer.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 DOMINEER mean?
DOMINEER verb- To rule over or control arbitrarily or arrogantly; to tyrannize.