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All answers having "Ghastly" as clue:

3 Character Answers:

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BAD

WAN



4 Character Answers:

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ASHY

GRIM



5 Character Answers:

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ASHEN

AWFUL

LURID



7 Character Answers:

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HIDEOUS

MACABRE



8 Character Answers:

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ASHWHITE

DREADFUL

GRUESOME

HORRIBLE

HORRIFIC



9 Character Answers:

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LOATHSOME



10 Character Answers:

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CADAVEROUS



12 Character Answers:

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BUTTERSCOTCH