The most common and most likely answer to this crossword clue is the 8 letter word LINEOUTS
I've seen this crossword clue in The Guardian
L
I
N
E
O
U
T
S
Buddy explains!
The straight part
We know that "dirty jumpers here" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dirty jumpers here = lineouts.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 LINEOUTS mean?
LINEOUTS noun- A set piece where the hooker throws the ball into play between a row of players from each team.
- The lineup of players in a lineout (sense 1).
- An out produced by catching a line drive.