American’s dropped ecstasy round bed where fliers might sleep (8)
I believe the answer is:
dovecote
'where fliers might sleep' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'american's dropped ecstasy round bed' is the wordplay.
'american's dropped' becomes 'dove' (I am not sure about this - if you are sure you should believe this answer much more).
'ecstasy' becomes 'E' (informal term for the drug).
'round' indicates putting letters inside.
'bed' becomes 'cot' (cot is a type of bed).
'dove'+'e'='dovee'
'dovee' going around 'cot' is 'DOVECOTE'.
Can you help me to learn more?
(Other definitions for dovecote that I've seen before include "Shelter for domesticated pigeons" , "Domestic bird shelter" , "Home for domesticated pigeons" .)