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All answers having "Surplus" as clue:

3 Character Answers:

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FAT

ODD

RHO



4 Character Answers:

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GLUT

OGRE

OVER



5 Character Answers:

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EXTRA

SPARE



6 Character Answers:

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EXCESS

PROFIT



7 Character Answers:

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OVERAGE



8 Character Answers:

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LEFTOVER

PLETHORA

UNNEEDED