Answer: trembler

AnswerCrossword Clue
TREMBLERSomeone showing fear
TREMBLERCatbird's quaking cousin
TREMBLERAspen, at times
TREMBLERQuaker
TREMBLERShaker
TREMBLERShaky one
TREMBLEROne quaking
TREMBLEROne with the shivers
TREMBLEROne with the shivers, e.g.
tremblerA songbird related to the thrashers, found in the Lesser Antilles and named from its habit of violent shaking
tremblerAn earthquake
tremblerone who trembles (to shake (to move to and fro with short, rapid movements))