Dispose of deranged acid eater (9)
I believe the answer is:
'dispose of' is the definition.
(I've seen this before)
'deranged acid eater' is the wordplay.
'deranged' indicates an anagram.
'acideater' is an anagram of 'ERADICATE'.
(Other definitions for eradicate that I've seen before include "Destroy completely" , "Exterminate, extinguish" , "Extinguish, wipe out" , "Stamp out, remove all traces of" , "Excise" .)