Sale arranged with EP in dreamland (6)
I believe the answer is:
asleep
'in dreamland' is the definition.
(I've seen this in another clue)
'sale arranged with ep' is the wordplay.
'arranged with' indicates anagramming the letters (letters rearranged).
'sale' mixed up with 'ep' makes 'ASLEEP'.
(Other definitions for asleep that I've seen before include "Conked out" , "Having nodded off" , "In the arms of Hypnos" , "this fast?" , "not paying attention" .)