Answer: collude

AnswerCrossword Clue
COLLUDE

Act in unison

COLLUDE

Cook up a scheme (with)

COLLUDE

Plot

COLLUDE
Conspire
COLLUDE
Cook up a plan (with)
COLLUDEPlan a heist (with)
COLLUDECabal
COLLUDEBe in cahoots
COLLUDEPlot (with)