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All answers having "Tidy" as clue:

3 Character Answers:

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SUM



4 Character Answers:

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NEAT

SNOD

SNUG

TRIM



5 Character Answers:

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CLEAN

KEMPT

LARGE



6 Character Answers:

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NEATEN



7 Character Answers:

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CLEANUP

INORDER

ORDERLY



8 Character Answers:

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NEATENUP



9 Character Answers:

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SHIPSHAPE



10 Character Answers:

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NEATASAPIN



11 Character Answers:

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SQUAREDAWAY



15 Character Answers:

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INAPPLEPIEORDER