Patient in cast massaged with oil (7)
I believe the answer is:
stoical
'patient' is the definition.
(I've seen this before)
'cast massaged with oil' is the wordplay.
'massaged with' indicates anagramming the letters (I've seen 'massage' mean this).
'cast' anagrammed with 'oil' makes 'STOICAL'.
'in' is the link.
(Other definitions for stoical that I've seen before include "Enduring hardship without complaining" , "Able to bear pain" , "Showing endurance" , "Brave in the face of pain" , "able to endure suffering" .)