Vast human waste with any number devoted to luxury (9)
I believe the answer is:
epicurean
'devoted to luxury' is the definition.
'vast human waste with any number' is the wordplay.
'vast' becomes 'epic'.
'human waste' becomes 'urea'.
'with' is a charade indicator (letters next to each other).
'any number' becomes 'n' (I've seen this in other clues).
'epic'+'urea'+'n'='EPICUREAN'
(Other definitions for epicurean that I've seen before include "Given to sensual enjoyment" , "one sensuous and Greek" , "One appreciating food and drink" , "Hedonistic" , "expert on food" .)