One who gets the treatment is not easily provoked (7)
I believe the answer is:
patient
'not easily provoked' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for patient that I've seen before include "One being treated" , "Calmly enduring like hospital inmate" , "Willing to wait" , "Unhurried" , "One receives medical care" .)