3 down
One
chooses
shock
treatment
in
role
reversal
(7)
One chooses shock treatment in role reversal (7)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Look at One chooses — that's your definition, someone who votes. Now for the wordplay: take role and reverse it to get ELOR, then slot in ECT (electroconvulsive therapy, your shock treatment) to get EL+ECT+OR.