Answer: jumpy

AnswerCrossword Clue
JUMPYWired on caffeine, perhaps
JUMPYSkittish
JUMPYOn edge
JUMPYLike a cat on a hot tin roof
JUMPYNervous
jumpyCharacterized by abrupt stops and starts or an irregular course
jumpynervous (easily excited)
jumpy(of a person) Anxious and uneasy