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All answers having "Call" as clue:

3 Character Answers:

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BET

CRI

CRY

DUB

REF

RUP

SEE

UMP



4 Character Answers:

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DIAL

HAIL

IMIN

NAME

RING

STAY



5 Character Answers:

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PHONE

RADIO

VISIT

WAKEN



6 Character Answers:

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BECKON

OPTION

RINGUP

SUMMON

YELLUP



7 Character Answers:

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CONVENE

ENTITLE

PHONEIN

REFEREE

SEEABET



9 Character Answers:

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TELEPHONE