Produce dope, Ecstasy, and speed (8)
I believe the answer is:
generate
'produce' is the definition.
(generating is a kind of producing)
'dope ecstasy and speed' is the wordplay.
'dope' becomes 'gen' (I've seen this in other clues).
'ecstasy' becomes 'e' (informal term for the drug).
'and' means one lot of letters go next to another.
'speed' becomes 'rate' (rate is a kind of speed**).
'gen'+'e'+'rate'='GENERATE'
(Other definitions for generate that I've seen before include "Make" , "Create for teenager" , "Cause to arise; produce" , "Teenager (anag) - green tea (anag)" , "Beget" .)