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All answers having "Shrewd" as clue:

3 Character Answers:

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ARE

RHO

SLY



4 Character Answers:

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ARCH

CAGY

CUTE

FOXY

KEEN

WILY



5 Character Answers:

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ACUTE

CAGEY

CANNY

HEADY

RIPUP

ROBOT

SAVVY

SHARP

SMART



6 Character Answers:

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ASTUTE

BERATE

CLEVER

CRAFTY

SAGACE

SUBTLE



7 Character Answers:

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ABIDING

AVENUES

CHAOTIC

CLUEDUP

KNOWING

SPORRAN



8 Character Answers:

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ALLTHERE



10 Character Answers:

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HARDHEADED

LONGHEADED



11 Character Answers:

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HYPERMARKET



12 Character Answers:

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BEATARETREAT



13 Character Answers:

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ILLUMINATIONS

PERSPICACIOUS