With 104-Down, playground fixture (6)

I believe the answer is:

teeter

(Other definitions for teeter that I've seen before include "Sway back and forth on the edge" , "Wobble as though about to fall" , "See-saw on the edge" , "Rock precariously on the edge" , "Balance unsteadily" .)

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

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