Hard-working and dealing with it without a break (8)
I believe the answer is:
diligent
'hard-working' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for diligent that I've seen before include "Assiduous" , "Conscientious and careful" , "Industrious" , "Thorough" , "Putting care and effort into work" .)