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All answers having "Neat!" as clue:

4 Character Answers:

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COOL

ETNA

NICE

PRIM

TIDY

TRIG

TRIM



5 Character Answers:

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CLEAN

KEMPT

NIFTY

NOICE



6 Character Answers:

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ASAPIN

SOCOOL

SPRUCE



7 Character Answers:

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CEREALS

DROPOFF

ICELESS

INORDER

ORDERLY

THOUGHT



8 Character Answers:

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STRAIGHT

ULTIMATE



9 Character Answers:

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COOLBEANS

SHIPSHAPE

UNDILUTED



15 Character Answers:

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INAPPLEPIEORDER