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All answers having "Glow" as clue:

4 Character Answers:

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AURA

BEAM



5 Character Answers:

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ARDOR

ASCOT

FLAME

SHINE



7 Character Answers:

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GLIMMER

RADIATE



8 Character Answers:

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OPALESCE

RADIANCE



9 Character Answers:

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FLUORESCE

LUMINESCE

PORTRAYAL