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All answers having "Discover" as clue:

3 Character Answers:

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SEE



4 Character Answers:

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ESPY

FIND

SUSS



5 Character Answers:

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DIGUP

GETAT

HITON

LEARN

TRUCE



6 Character Answers:

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DESCRY

DETECT

FERRET

INVENT

LOCATE



7 Character Answers:

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FINDOUT

HITUPON

LEARNOF

UNEARTH



8 Character Answers:

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COMEUPON



9 Character Answers:

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ASCERTAIN



11 Character Answers:

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COMMONSENSE