Answer: dirtytrick

AnswerCrossword Clue
DIRTYTRICK

Example of polluted politics

DIRTYTRICK

Fast one

DIRTYTRICK

Foul play

DIRTYTRICK
This isn't cricket!
DIRTYTRICK
Prank that's not nice
DIRTYTRICKMean prank
DIRTYTRICKUnkind caper
DIRTYTRICKDubious tactic
DIRTYTRICKD-Con?
DIRTYTRICKBit of foul play