Relief from the unipolar economic ideology at last (5)
I believe the answer is:
mercy
'relief' is the definition.
(thesaurus)
'from the unipolar economic ideology at last' is the wordplay.
'at last' indicates one should take the final letters.
The last letters of 'from the unipolar economic ideology' are 'MERCY'.
(Other definitions for mercy that I've seen before include "Forbearance" , "Clemency or compassion" , "Pity" , "Compassion for the unfortunate" , "Its quality is not strained, Portia said" .)