Waste cleaned in plant (9)
I believe the answer is:
celandine
'plant' is the definition.
(celandine is a kind of plant)
'waste cleaned in' is the wordplay.
'waste' is an anagram indicator (I've seen 'wasted' mean this).
'cleaned'+'in'='cleanedin'
'cleanedin' anagrammed gives 'CELANDINE'.
(Other definitions for celandine that I've seen before include "Land niece with the swallowwort." , "Plant of buttercup family" , "... one blooming" , "Flowering plant - decennial (anag)" .)