Henceforth (4,3,2)
'henceforth' is the definition.
(synonyms)
This is all the clue.
(Another definition for from now on that I've seen is " In future".)
(Other definitions for evermore that I've seen before include "unceasingly" , "For which, permanently" , "Eternally" , "Always and without end" , "Forever (literary)" .)
'henceforth' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for hereafter that I've seen before include "Hence" , "Life in the future" , "In subsequent parts of legal document" .)