Write article supporting new Ecstasy drug (8)
I believe the answer is:
nepenthe
'drug' is the definition.
(I've seen this before)
'write article supporting new ecstasy' is the wordplay.
'write' becomes 'pen' (synonyms).
'article' becomes 'the' (the definite article in English).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'ecstasy' becomes 'E' (informal term for the drug).
'pen'+'the'='penthe'
'n'+'e'='ne'
'penthe' put after 'ne' is 'NEPENTHE'.
(Other definitions for nepenthe that I've seen before include "drink to forget" , "pain reliever" , "The drink causing sorrow to be forgotten, poetically" , "Pitcher-plant" , "sleep-inducing drug" .)