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All answers having "Disappear" as clue:

3 Character Answers:

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LAM



4 Character Answers:

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EVAP

FADE

FLEE

LYSE

MELT



5 Character Answers:

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ERODE

IMPEL

SALVO

URALS



6 Character Answers:

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DIEOUT

ESCAPE

GOAWOL

GOPOOF

PERISH

RECEDE

VANISH



7 Character Answers:

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CEASOBE

EVANISH

WEAROFF



8 Character Answers:

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EVANESCE



9 Character Answers:

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APPRAISED

CEASETOBE

EVAPORATE

GOMISSING



11 Character Answers:

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DOUTOFSIGHT



15 Character Answers:

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DOAKISSINGERACT