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All answers having "Football" as clue:

3 Character Answers:

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FAN



4 Character Answers:

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OVAL



5 Character Answers:

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ARENA

GAMES

PIGSN

RUGBY

SPORT



6 Character Answers:

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ELEVEN

SOCCER



7 Character Answers:

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NERVOUS

PIGSKIN



9 Character Answers:

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PASSSPORT

SUPERBOWL



10 Character Answers:

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AGAMEOFTWO



12 Character Answers:

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CONTACTSPORT