Answer:

instigate

Answer	Crossword Clue
INSTIGATE	Start, as trouble
INSTIGATE	Provoke
INSTIGATE	Foment

INSTIGATE	Provoke.
INSTIGATE	Spur on to some action.
INSTIGATE	Urge on to some action.
INSTIGATE	Start a riot
INSTIGATE	Be behind

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.