Frantic preparation of stimulant drug (4-6)
I believe the answer is:
last-minute
'frantic' is the definition.
(both can mean rushed or hurried)
'preparation of stimulant drug' is the wordplay.
'preparation of' indicates an anagram (I've seen this in other clues).
'drug' becomes 'e' (e is another name for ecstasy).
'stimulant' with letters rearranged gives 'lastminut'.
'lastminut'+'e'='LAST-MINUTE'
(Other definitions for last-minute that I've seen before include "Eleventh-hour" , "very late" , "Done at the latest possible moment" , "Eleventh hour" , "Done at the final moment" .)