Foreshadows
I believe the answer is:
'foreshadows' is the definition.
('presage' can be a synonym of 'foreshadow')
This is the entire clue.
(Other definitions for presages that I've seen before include "Foreshadows in press age" , "Augurs, bodes" , "Forecasts" , "Foreshadows, is advance sign of" .)