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All answers having "Platform" as clue:

3 Character Answers:

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EWE

TIN



4 Character Answers:

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DAIS

DECK

PEAR

SHOE

TECH

VETO



5 Character Answers:

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ALTAR

INERT

SOLES

STAGE



6 Character Answers:

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GLOOMY

PALLET

PODIUM



7 Character Answers:

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EARSHOT

ESTRADE

NIBBLES

OURLADY

ROSTRUM