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All answers having "Crackers" as clue:

3 Character Answers:

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MAD



4 Character Answers:

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BATS

DAFT

GAGA

LOCO

NUTS

SODA



5 Character Answers:

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BATTY

LOONY

LOOPY

NUTSO

NUTSY



6 Character Answers:

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ANIMAL

INSANE

PSYCHO

WAFERS



7 Character Answers:

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GRAHAMS



8 Character Answers:

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SALTINES



11 Character Answers:

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DOGBISCUITS