Part of Venezuela due for uprising, like most of Europe once (6)
I believe the answer is:
feudal
'like most of europe once' is the definition.
'part of venezuela due for uprising' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'uprising' shows that the letters should be reversed in order.
'laduef' is hidden in the letters of 'venezuela due for'.
'laduef' in reverse letter order is 'FEUDAL'.
(Other definitions for feudal that I've seen before include "Of system of land-holding in Middle Ages" , "Like medieval society" , "Reactionary" , "Resembling or relating to a medieval social system" , "related to outdated system" .)