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All answers having "Eyeball" as clue:

3 Character Answers:

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ORB

SEE



4 Character Answers:

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LEER

OGLE

SCAN



5 Character Answers:

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STARE



6 Character Answers:

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ASSESS

PEEPER

PERUSE

SIZEUP



7 Character Answers:

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INSPECT

STAREAT



8 Character Answers:

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SCOPEOUT