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All answers having "Trifling sum" as clue:

3 Character Answers:

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SOU



4 Character Answers:

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MITE

SONG



5 Character Answers:

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GROAT



7 Character Answers:

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DRIBLET

REDCENT

TWOBITS



11 Character Answers:

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CHICKENFEED

CHUMPCHANGE



15 Character Answers:

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DROPINTHEBUCKET

NICKELSANDDIMES