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Hard-working and dealing with it without a break (8)

Ross

I believe the answer is:

diligent

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'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" .)

I've seen this clue in The Guardian.
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