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All answers having "Interval" as clue:

3 Character Answers:

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GAP

LAG

RHO



4 Character Answers:

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REST

SPAN

TIME

WAIT



5 Character Answers:

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BREAK

LAPSE

SPACE



6 Character Answers:

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HIATUS

PERIOD



7 Character Answers:

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TIMEGAP



8 Character Answers:

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MEANTIME



9 Character Answers:

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TIMEFRAME

TIMELAPSE



12 Character Answers:

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INTERMISSION