Answer: setsin

AnswerCrossword Clue
SETSINStarts to take effect
SETSINGets established
SETSINTakes hold
SETSINTakes root
SETSINBegins to work
SETSINBecomes prevalent.
SETSINBegins.
SETSINArrives
SETSINBegins gradually
SETSINBecomes entrenched
SETSINBecomes established
SETSINBegins to prevail
SETSINBecomes pervasive
SETSINBegins
SETSINArrives, as darkness
SETSINTakes effect
SETSINBegins to take effect