Long-suffering client of quack (7)

I believe the answer is:

patient

I'm a little stuck... Click here to teach me more about this clue!

'long-suffering' is the definition.
(similar in meaning)

I don't understand how the remainder of the clue works.

(Other definitions for patient that I've seen before include "Not easily provoked" , "Willing to wait" , "one of interest to medics?" , "Enduring trying circumstances with an even temper" , "Long-suffering - one under treatment" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.