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All answers having "Modify" as clue:

4 Character Answers:

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BEND

DYKE

EDIT

KEEP

REDO

VARY



5 Character Answers:

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ADAPT

ALTER

AMEND

REMIX



6 Character Answers:

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ADJUST

CHANGE

RECAST

RECODE

REMEDY

RETOOL

TAILOR

TEMPER



8 Character Answers:

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CHASTISE