Be sure voter gets this reversing excessive employment (7)
I believe the answer is:
overuse
'excessive employment' is the definition.
(I've seen this before)
'be sure voter gets this reversing' is the wordplay.
'gets' says the answer is hidden in the clue.
'this reversing' is a reversal indicator.
'esurevo' can be found hidden inside 'be sure voter'.
'esurevo' in reverse letter order is 'OVERUSE'.
(Other definitions for overuse that I've seen before include "why injury may occur" , "Oeuvres (anag.)" , "Excessively utilise" , "Excessive consumption" , "Too much work" .)