The pursuit of pleasure (8)
I believe the answer is:
hedonism
'the pursuit of pleasure' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hedonism that I've seen before include "The pursuit of and devotion to pleasure" , "His demon (anag.)" , "The pursuit of happiness as a matter of principle" , "Pleasure-seeking" , "Belief that pleasure is the highest good" .)