Extinguish, wipe out (9)
I believe the answer is:
eradicate
This clue is a double definition.
'extinguish' is the first definition.
(I know that extinguish can be written as eradicate)
'wipe out' is the second definition.
(I know that wipe out can be written as eradicate)
(Other definitions for eradicate that I've seen before include "Exterminate, extinguish" , "carry out a purge" , "Dispose of" , "Kill" , "Expunge" .)