Words about vote offensive (4)
I believe the answer is:
text
'words' is the definition.
(I've seen this before)
'about vote offensive' is the wordplay.
'about' indicates putting letters inside.
'vote' becomes 'x' (how votes are marked).
'offensive' becomes 'tet' (I've seen this in other clues).
'x' inserted into 'tet' is 'TEXT'.
(Other definitions for text that I've seen before include "Biblical passage" , "Written matter" , "Contact" , "Written material for study" , "'Words, not illustrations (4)'" .)