Uncomplaining philosopher (5)
I believe the answer is:
stoic
This clue is a double definition.
'uncomplaining' is the first definition.
(I've seen this in another clue)
'philosopher' is the second definition.
(Stoic is an example)
(Other definitions for stoic that I've seen before include "Unflappable type" , "Ancient philosopher" , "Athenian philosopher" , "Greek in school" , "Solemn ceremony" .)