Answer: adwar

AnswerCrossword Clue
ADWARPAC battle
ADWARPitching duel?
ADWARExchange of nasty spots
ADWARNasty marketing campaign
ADWARNegative campaign feature
ADWARExpensive campaign of a sort
ADWARExchange of TV smears, maybe
ADWARExchange of smears
ADWARFeature of a nasty campaign, often
ADWARSeries of battling spots
ADWARExchange of negative commercials