Answer:

stick

AnswerCrossword Clue
STICKSomething to play fetch with
STICKSee 5-Across
STICKManual
STICKFeature of this puzzle's three long Down answers
STICKLinger
STICKAdhere
STICKHave permanent effect
STICK22-Down unit
STICKIntentionally baffle
STICKCinnamon unit