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All answers having "-- jiffy" as clue:

3 Character Answers:

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INA

SEC



4 Character Answers:

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LUBE

SNAP



5 Character Answers:

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FLASH

TRICE



6 Character Answers:

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HOTSEC

MINUTE

MOMENT



7 Character Answers:

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EASTERN

INSTANT



9 Character Answers:

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HOTSECOND



11 Character Answers:

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BRIEFMOMENT