Lapsed drunk consuming house plant (8)
I believe the answer is:
asphodel
'plant' is the definition.
(type of flower)
'lapsed drunk consuming house' is the wordplay.
'drunk' indicates an anagram.
'consuming' means one lot of letters goes inside another.
'house' becomes 'ho' (abbreviation for house).
'lapsed' is an anagram of 'aspdel'.
'aspdel' placed around 'ho' is 'ASPHODEL'.
(Other definitions for asphodel that I've seen before include "blooms from Elysian fields" , "Mediterranean plant" , "Shop deal (anag.)" , "Lily-like plant, the flower of death to ancient Greeks" , "Flower of lily family - old heaps (anag)" .)