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All answers having "Frugal" as clue:

4 Character Answers:

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SKIN



5 Character Answers:

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SPARE



6 Character Answers:

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SAVING

STINGY



7 Character Answers:

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NEGLECT

PRUDENT

SCRIMPY

SPARING

SPARTAN

THRIFTY



9 Character Answers:

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SPARESOME



10 Character Answers:

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ECONOMICAL



13 Character Answers:

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PENNYPINCHING