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All answers having "Beam" as clue:

3 Character Answers:

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HAT

ION

RAY

TIE



4 Character Answers:

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ACHE

EMIT

GLOW

GRIN

IBAR

JIMS

LASE

MEUP

SMLE

SPAR

TBAR

ZEST



5 Character Answers:

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CRUSH

JOIST

LASER

SHAFT

SHINE

SMILE

TOTUP

WIDTH



6 Character Answers:

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GIRDER

RAFTER

SUNRAY



7 Character Answers:

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BALANCE

RADIATE



8 Character Answers:

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ERADIATE



10 Character Answers:

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RAYOFLIGHT