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All answers having "SEE 23 ACROSS" as clue:

3 Character Answers:

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ASS

END

EWE

FAN

GEL

POP

TEA

THE



4 Character Answers:

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ALIA

BURN

CENT

CUBE

DOWN

EDGE

HANS

HILL

ICAN

KNOX

LASS

LATE

MORI

ONES

SUIT



5 Character Answers:

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ANDRE

BETHS

CLARK

CROSS

GEARS

LEPEN

LUCAS

MEDAL

PERRY

YEARS



6 Character Answers:

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AUTUMN

GRAHAM

LIVELY

LONELY

MAMMAS

MANTEL

MOINES

MYSELF

OFTIME

SMELLY

UPTOME



7 Character Answers:

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CONNERY

HISTORY

LEONARD

MINOGUE

PIPPINS

SELSSPR

THOMSON



8 Character Answers:

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BIENNALE

KATANGAN

OFBUNKER

SOPRANOS



10 Character Answers:

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APPLESAUCE

PRESSCORPS



11 Character Answers:

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ATYOURPHONE

CLAMCHOWDER

ITSADISEASE



12 Character Answers:

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ASADAYINJUNE

CARNEGIEHALL



13 Character Answers:

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WHOHELPOTHERS



17 Character Answers:

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YOUMUSTKEEPMOVING



18 Character Answers:

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GETSWHATWHENANDWHY

THESCIENCEOFHOWWHO



21 Character Answers:

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ATBOTHTHEPOLARREGIONS