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All answers having "Allow" as clue:

3 Character Answers:

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LAY

LET

OWN



4 Character Answers:

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OKAY

PLAY

STUN

ZERO



5 Character Answers:

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ADMIT

DACHA

NERVE

OPINE



6 Character Answers:

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ENABLE

GARNET

PERMIT

SIMPER

SUFFER

UNFURL



7 Character Answers:

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ENTITLE

LICENSE

OARSMAN

TERRINE



8 Character Answers:

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LEGALIZE

TOLERATE



12 Character Answers:

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COURTMARTIAL



13 Character Answers:

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ABITONTHESIDE

FILINGCABINET