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All answers having "Combat" as clue:

3 Character Answers:

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WAR



4 Character Answers:

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DUEL

FRAY



5 Character Answers:

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BOOTS

CLASH

FIGHT

NAKED

SWORD



6 Character Answers:

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ACTION

BATTLE

HORSDE

OPPOSE

PRECIS



13 Character Answers:

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ARMEDCONFLICT