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All answers having "Get up" as clue:

3 Character Answers:

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BAT



4 Character Answers:

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ALEG

FEET

RISE

WAKE



5 Character Answers:

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ARISE

AVERT

AWAKE

ELATE

HOIST

ROUSE

ROUST

STAND

WAKEN



6 Character Answers:

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ASCEND

AWAKEN

GIDDAP



12 Character Answers:

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RISEANDSHINE