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All answers having "part" as clue:

3 Character Answers:

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BIT

RHO

SEP



4 Character Answers:

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ACTA

AREA

HALF

ROLE

RRLE

UNIT



5 Character Answers:

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ACTSA

ANODE

PIECE

SEVER

SHARE

SPLIT



6 Character Answers:

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BEHALF

DIVIDE

MEMBER

SUNDER



7 Character Answers:

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DISJOIN

ELEMENT

PORTION

SECTION

SEGMENT



8 Character Answers:

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FILMROLE

FRACTION

FRAGMENT

HEADLINE

SEPARATE



9 Character Answers:

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COMPONENT



10 Character Answers:

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PERCENTAGE