Pandora's box remnant (4)
I believe the answer is:
hope
'pandora's box remnant' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hope that I've seen before include "writer" , "Aspiration" , "The last thing in Pandora's Box" , "Feeling of expectant desire" , "Positive expectation" .)