Sponge misplaced under dark English shed (8)
I believe the answer is:
drunkard
'sponge' is the definition.
(thesaurus)
'misplaced under dark english shed' is the wordplay.
'misplaced' is an anagram indicator.
'english' becomes 'E' (abbreviation).
'shed' suggests deleting specific letters ('shed' as in 'cut away').
'under'+'dark'='underdark'
'underdark' with 'e' taken away is 'undrdark'.
'undrdark' with letters rearranged gives 'DRUNKARD'.
(Other definitions for drunkard that I've seen before include "One regularly intoxicated" , "Sot, addicted drinker" , "alkie" , "Habitual inebriate" , "One gets soaked" .)