Participants in democracy strove for change (6)
I believe the answer is:
voters
'participants in democracy' is the definition.
'strove for change' is the wordplay.
'for change' indicates anagramming the letters (I've seen this in other clues).
'strove' anagrammed gives 'VOTERS'.
(Other definitions for voters that I've seen before include "Selectors" , "They cast ballots" , "Electors" .)