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All answers having "Frustrate" as clue:

4 Character Answers:

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BALK

DASH

FOIL

TRAY



5 Character Answers:

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DATED

DAUNT

DETER

IBIZA

STYMY



6 Character Answers:

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BAFFLE

BLIGHT

DEFEAT

DERAIL

HAMPER

OUTWIT

STYMIE

THWART



7 Character Answers:

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INHIBIT