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All answers having "Fastidious" as clue:

4 Character Answers:

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NEAT

NICE

TIDY



5 Character Answers:

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CHARY

FUSSY

PICKY



6 Character Answers:

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CHOOSY

DAINTY

PRISSY



7 Character Answers:

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ELEGANT

REFINED



8 Character Answers:

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OVERNEAT

OVERNICE



9 Character Answers:

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SQUEAMISH



10 Character Answers:

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PARTICULAR



14 Character Answers:

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DETAILORIENTED