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All answers having "Up the creek" as clue:

5 Character Answers:

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IDIOM

INBAD



6 Character Answers:

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DOOMED

INAFIX

INAJAM

INDEEP



7 Character Answers:

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INASPOT

INDUTCH



9 Character Answers:

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INAPICKLE

INASCRAPE

INTROUBLE



10 Character Answers:

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INHOTWATER