Answer: trigger

AnswerCrossword Clue
TRIGGER

Finger lever

TRIGGER

Set off

TRIGGER

Activate

TRIGGER
"The smartest horse in the movies"
TRIGGER
Roy Rogers' co-star.
TRIGGERNoted movie equine.
TRIGGERRoy Rogers' horse.
TRIGGERFamous movie horse.
TRIGGERRoy Rogers's palomino
TRIGGERRoy Rogers's steed
TRIGGERRoy Rogers's horse
TRIGGERButtermilk's companion
TRIGGERRoy Rogers' horse
TRIGGERHe ran under Rogers
TRIGGERCause