Insecticide found in illegal drink (6)
I believe the answer is:
aldrin
'insecticide' is the definition.
(I know that Aldrin is a insecticide)
'in illegal drink' is the wordplay.
'in' indicates a hidden word.
'ALDRIN' is hidden within 'illegal drink'.
'found' acts as a link.
(Other definitions for aldrin that I've seen before include "'Buzz' -, US astronaut" , "Buzz . . . . . ., moonwalker" , "Buzz, second man on moon" .)