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All answers having "Shortly" as clue:

4 Character Answers:

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ANON

ASAP

SOON



6 Character Answers:

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AWHILE

INABIT

INAFEW

INASEC



7 Character Answers:

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BRIEFLY

ERELONG

INBRIEF



8 Character Answers:

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DIRECTLY

INAWHILE



9 Character Answers:

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INAMINUTE

INAMOMENT

INASECOND



14 Character Answers:

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AMTTOSOMETHING



15 Character Answers:

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BEFOREYOUKNOWIT