The most common and most likely answer to this crossword clue is the 5 letter word SLOGS
S
L
O
G
S
Buddy explains!
The straight part
We know that "Labours" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case labours = slogs.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 SLOGS mean?
SLOGS noun- A long, tedious walk, or session of work.
- An aggressive shot played with little skill.