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All answers having "When" as clue:

3 Character Answers:

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NOW

SAY



4 Character Answers:

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ONCE



5 Character Answers:

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ENNUI

IFAND

NOTIF

ODIUM

SINCE



6 Character Answers:

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INROME

NOMORE

SCENEI

SOONAS



8 Character Answers:

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ASSOONAS



10 Character Answers:

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SCENETHREE



13 Character Answers:

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SATURDAYINMAY



17 Character Answers:

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NINETEENTHIRTYSIX



18 Character Answers:

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FIFTEENEIGHTYSEVEN