Pleasure seeker wandering into shed (8)
I believe the answer is:
hedonist
'pleasure seeker' is the definition.
(I know that pleasure seeker can be written as hedonist)
'wandering into shed' is the wordplay.
'wandering' is an anagram indicator.
'into'+'shed'='intoshed'
'intoshed' with letters rearranged gives 'HEDONIST'.
(Other definitions for hedonist that I've seen before include "Epicurean" , "Thrill-seeker" , "One who lives only for pleasure" , "Extreme pleasure-seeker" , "he puts pleasure before work" .)