Answer: peeker

AnswerCrossword Clue
PEEKER

Blindman's buff cheater

PEEKER

Cheater, perhaps

PEEKER

One who looks in advance

PEEKER
One who shouldn't be looking
PEEKER
Surprise spoiler, perhaps
PEEKERHide-and-seek cheater
PEEKEROne at a keyhole maybe
PEEKERBlind man's buff cheater