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All answers having "Twinkle" as clue:

4 Character Answers:

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BEAM

WINK



5 Character Answers:

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BLINK

GLEAM

GLINT

SHINE



6 Character Answers:

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HATTER



7 Character Answers:

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GLIMMER

RADIATE

SHIMMER



11 Character Answers:

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SCINTILLATE