Answer: setsin

AnswerCrossword Clue
SETSIN

Becomes entrenched

SETSIN

Begins to take effect

SETSIN

Takes effect

SETSIN
Arrives, as darkness
SETSIN
Begins
SETSINBecomes pervasive
SETSINBegins to prevail
SETSINBecomes established
SETSINStarts to take effect
SETSINBegins gradually
SETSINArrives
SETSINBegins.
SETSINBecomes prevalent.
SETSINBegins to work
SETSINTakes root
SETSINTakes hold
SETSINGets established