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All answers having "Discard" as clue:

4 Character Answers:

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DUMP

SHED

TOSS



5 Character Answers:

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DEEPS

DITCH

SCRAP

SLUFF



6 Character Answers:

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REJECT

SLOUGH



7 Character Answers:

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CASTOFF

TOSSOUT



8 Character Answers:

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CHUCKOUT

JETTISON

SETASIDE

THROWOUT



9 Character Answers:

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CASTASIDE

THROWAWAY



13 Character Answers:

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CIVILSERVANTS