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All answers having "Sports official" as clue:

3 Character Answers:

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REF



4 Character Answers:

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ACHE

BOSS



5 Character Answers:

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AFTER

FEMUR

TIMER



6 Character Answers:

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SCORER

UMPIRE



7 Character Answers:

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GROWNUP

OVERLAP

REFEREE

STARTER

TALLEST



8 Character Answers:

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EYETOOTH



11 Character Answers:

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SCOREKEEPER