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All answers having "Excel" as clue:

3 Character Answers:

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CAP

CUP

TOP



4 Character Answers:

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BEST

LEAD

STAR

WAIL



5 Character Answers:

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ELECT

OUTDO

SHINE



7 Character Answers:

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ACHIEVE

SURPASS



8 Character Answers:

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GETAHEAD

OUTSHINE

OUTSTRIP



11 Character Answers:

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TAKETHECAKE



13 Character Answers:

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GETGOODGRADES