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All answers having "Since" as clue:

3 Character Answers:

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AGO

CUZ

FOR

NOW



4 Character Answers:

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ASOF

EVER

SEIT

SYNE



5 Character Answers:

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BEING

SPIES



6 Character Answers:

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INTHAT



7 Character Answers:

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BECAUSE



8 Character Answers:

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ASLONGAS

INASMUCH