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All answers having "Custom" as clue:

3 Character Answers:

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TAX

USE

WAY



4 Character Answers:

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MADE

MODE

MUTE

NORM

RITE

ROTE

RULE

WONT



5 Character Answers:

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CROCK

DIGIT

HABIT

SHRUB

USAGE



6 Character Answers:

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HOTROD

MANNER

RITUAL



7 Character Answers:

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ENDLESS

REDUCED

ROUTINE

TOORDER



8 Character Answers:

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PRACTICE



9 Character Answers:

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TRADITION



10 Character Answers:

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TAILORMADE



11 Character Answers:

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MADETOORDER



15 Character Answers:

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CONVENTIONALITY