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All answers having "Fix up" as clue:

4 Character Answers:

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EDIT

MEND

REDO

TIDY



5 Character Answers:

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AMEND

EMEND

REFIT

REHAB



6 Character Answers:

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RELINE

REPAIR



7 Character Answers:

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REMODEL

RESTAIN

RESTORE

RETOUCH



8 Character Answers:

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RENOVATE



9 Character Answers:

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REFURBISH