Judge rings about ballot box hack (6)
I believe the answer is:
journo
'hack' is the definition.
(I've seen this before)
'judge rings about ballot box' is the wordplay.
'judge' becomes 'J' (abbreviation for judge).
'rings' becomes 'oo' (multiple circles).
'about' indicates putting letters inside.
'ballot box' becomes 'urn' (urn can mean a ballot box in some countries).
'oo' placed around 'urn' is 'ourno'.
'j'+'ourno'='JOURNO'
(Other definitions for journo that I've seen before include "Hack" , "Newspaper writer, colloquially" , "Newspaper employee (slang)" , "sub?" .)