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All answers having "Appear" as clue:

3 Character Answers:

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ACT

POP

RHO



4 Character Answers:

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COME

CROP

ISLE

LOOK

LOOM

RISE

SEEM

SHOW

WASP

ZERO



5 Character Answers:

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ARISE

ENTER

OCCUR

POPUP



6 Character Answers:

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ARRIVE

BESEEN

CROPUP

EMERGE

LEEWAY

SEEMTO

SHOWUP

TURNUP

UPWELL



8 Character Answers:

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DUMBBELL

SEEMTOBE

TAKEPART



11 Character Answers:

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ESTABLISHED



15 Character Answers:

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COMEDOWNTHEPIKE