Stamp out Ecstasy spread around clubs (9)
I believe the answer is:
eradicate
'stamp out' is the definition.
(thesaurus)
'ecstasy spread around clubs' is the wordplay.
'ecstasy' becomes 'e' (informal term for the drug).
'spread' becomes 'radiate'.
'around' is an insertion indicator.
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'radiate' placed around 'c' is 'radicate'.
'e'+'radicate'='ERADICATE'
(Other definitions for eradicate that I've seen before include "Excise" , "Get rid of, remove all traces" , "Extinguish, wipe out" , "Destroy completely" , "Exterminate, extinguish" .)