Pursuit of pleasure (8)
I believe the answer is:
hedonism
'pursuit of pleasure' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for hedonism that I've seen before include "The belief that pleasure is the chief good in life" , "His demon (anag.)" , "The pursuit of and devotion to pleasure" , "System based on pleasure as the highest good" , "Living for pleasure" .)