Crossword Genius

Game that helps teach object permanence (8)

Ross

I believe the answer is:

peekaboo

(Other definitions for peekaboo that I've seen before include "Toddler's face-hiding game" , "Partially revealing" , "Childrens hiding game" , "minor revelations" , "Game played with young children" .)

I've seen this clue in The New York Times.
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