Unresolved issue got easier after taking ecstasy together (5,3)
I believe the answer is:
loose end
'unresolved issue' is the definition.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for loose end that I've seen before include "unfinished work" , "The bored, idle at one" , "'A detail not settled or explained (5,3)'" , "where one's idling" , "As yet unexplained detail" .)