Time must be invested in genuine uprising in due course (5)
I believe the answer is:
later
'in due course' is the definition.
(I've seen this before)
'time must be invested in genuine uprising' is the wordplay.
'time' becomes 't'.
'must be invested in' indicates putting letters inside.
'genuine' becomes 'real' ('real' is associated in meaning with 'genuine').
'uprising' shows that the letters should be reversed in order.
't' put into 'real' is 'retal'.
'retal' in reverse letter order is 'LATER'.
(Other definitions for later that I've seen before include "more modern" , "Eventually" , "When to see you?" , "behind schedule" , "At a subsequent time" .)