Mad poet and playwright, dropping Ecstasy (4)
I believe the answer is:
wild
'mad' is the definition.
('wild' can be similar in meaning to 'mad')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for wild that I've seen before include "Unrestrained" , "Tempestuous" , "Not domesticated" , "Fierce" , "Born Free?" .)