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All answers having "Secret" as clue:

3 Character Answers:

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AGE

TOP



4 Character Answers:

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LAIR



5 Character Answers:

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AGENT

AWFUL

CODED

INNER

PRIVY

RUNIC

SANTA

SIEVE

STASH

TRADE



6 Character Answers:

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ARCANE

CLOSET

COVERT

INSIDE

INWARD

OCCULT

RECIPE

UNTOLD



7 Character Answers:

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ADMIRER

ARCANUM

CRYPTIC

EPOPTIC

IVEGOTA

PRIVATE



8 Character Answers:

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ESOTERIC

HUSHHUSH

VICTORIA



9 Character Answers:

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DEODORANT



10 Character Answers:

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ENCIPHERED

UNDERCOVER



11 Character Answers:

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CLANDESTINE

FURTIVEILED



12 Character Answers:

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CONFIDENTIAL