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All answers having "Postpone" as clue:

3 Character Answers:

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PUT



4 Character Answers:

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DUEL

STAY

WAIT



5 Character Answers:

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DEFER

DELAY

REMIT

ROBOT

SITON

TABLE

WAIVE



6 Character Answers:

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DETAIN

EXTEND

PUTOFF

SHELVE



7 Character Answers:

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ADJOURN

CAESIUM

LAYOVER

PUTOVER

SHUTTER

SLEEPON

TRAPEZE



8 Character Answers:

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HOLDOVER

PUTONICE



9 Character Answers:

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STANDOVER



11 Character Answers:

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WENSLEYDALE



12 Character Answers:

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SETTOONESIDE