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All answers having "Playground item" as clue:

4 Character Answers:

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ONLY



5 Character Answers:

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ABYSS

CADDY

LIMIT

NIGHT

OFFAL

SLIDE

SWING



6 Character Answers:

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ENAMEL

IMPAIR

SEESAW

TEETER



7 Character Answers:

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CALLBOX

EEEROER

INEXACT



8 Character Answers:

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EXCHANGE