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All answers having "Struggle" as clue:

3 Character Answers:

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VIE

WAR



4 Character Answers:

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AGON

BOUT

CLAW

COPE

FRAY

TOIL



5 Character Answers:

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FIGHT

HEAVE

LABOR

PIXEL

REPEL

SETTO



6 Character Answers:

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BATTLE

COMBAT

EFFORT

JIGSAW

NIBBLE

STRIVE

TUSSLE



7 Character Answers:

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AGONISE

AGONIZE

COMPETE

CONTEND

CONTEST

ENTICED

WRESTLE



8 Character Answers:

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TUGOFWAR



9 Character Answers:

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TIGHTSPOT



10 Character Answers:

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CONTENTION



11 Character Answers:

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REGRETTABLE