Brute posed touring hell (6)
I believe the answer is:
sadist
'brute' is the definition.
(a sadist enjoys inflicting pain)
'posed touring hell' is the wordplay.
'posed' becomes 'sat' (posed or sat for an artist).
'touring' means one lot of letters goes inside another (tour can mean to go around).
'hell' becomes 'dis' (term for the underworld in Greek myth).
'sat' going around 'dis' is 'SADIST'.
(Other definitions for sadist that I've seen before include "Tormentor" , "One enjoying inflicting pain" , "One enjoying hurting others" , "An amalgam, made up of two or more parts" , "Person who enjoys inflicting pain on others" .)