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All answers having "Without warning" as clue:

5 Character Answers:

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TUTOR



6 Character Answers:

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ABRUPT

ALLOFA

SUDDEN



8 Character Answers:

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ABRUPTLY

SUDDENLY

UNAWARES



9 Character Answers:

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ALLATONCE



10 Character Answers:

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LASTMINUTE



12 Character Answers:

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ALLOFASUDDEN

OUTOFTHEBLUE



14 Character Answers:

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OUTOFACLEARSKY