Answer:

gadfly

Answer	Crossword Clue
GADFLY	Annoying sort
GADFLY	Political troublemaker
GADFLY	Irksome critic

GADFLY	Annoying insect.
GADFLY	Pest.
GADFLY	Pest
GADFLY	Provocative pest
GADFLY	Persistent pest
GADFLY	Annoying critic
GADFLY	Persistent, irritating critic
GADFLY	Annoying person

GADFLY	Troublemaker