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All answers having "See 18 Across." as clue:

3 Character Answers:

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GAP

HST



4 Character Answers:

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ASTO

BLUE

CLEF

DDAY

DEAN

DOWN

ETAL

LANE

MESS

POET

RAIN

RIEN

ROLE

RYAN

THIS

WALL



5 Character Answers:

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BLUES

BURNS

HYNDE

LIGHT

SMOKE

STACK

TIMOR

WATER



6 Character Answers:

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SHARIF



7 Character Answers:

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DEADEND



8 Character Answers:

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CULDESAC

MCCARTHY



9 Character Answers:

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ALTITUDES

MUSTACHES

SUBMARINE

WRONGTREE



10 Character Answers:

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ABOUTHARRY

BYTHEDOZER

NEUTRALIST

SMARVELOUS

STATETREES

THEBALANCE



11 Character Answers:

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BOTTOMRIGHT



12 Character Answers:

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SILVOUSPLAIT



14 Character Answers:

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OFINDEPENDENCE

THECUCKOOSNEST



15 Character Answers:

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AWAYFROMALLTHIS

REACHINGEXTREME