The most common and most likely answer to this crossword clue is the 8 letter word HARDBALL
I've seen this crossword clue in The Daily Telegraph
H
A
R
D
B
A
L
L
Buddy explains!

The straight part
We know that "rough tactics" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rough tactics = hardball.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 HARDBALL mean?
HARDBALL noun- In baseball, a type of ball and baseball game, as opposed to softball.
- Tough or ruthless behavior, especially in combat, politics or business.
- Being or exhibiting tough or ruthless behavior, especially in combat, politics or business.