Put out drugs for trials (7)
I believe the answer is:
crosses
'trials' is the definition.
('cross' can be a synonym of 'trial')
'put out drugs' is the wordplay.
'put out' becomes 'cross' (I've seen this before).
'drugs' becomes 'es' (E is a term for an ecstasy pill).
'cross'+'es'='CROSSES'
'for' acts as a link.
(Other definitions for crosses that I've seen before include "Traverses" , "Goes over" , "religious symbols" .)