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All answers having "One" as clue:

3 Character Answers:

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ACE

ACT

ANE

ANY

EIN

HEN

HUT

SEC

UMA

UNA

UNE

UNI

UNO

WAY



4 Character Answers:

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ACME

ADAY

BILL

BUCK

EINE

EINS

HALF

MACH

NOTA

OCAT

ODDS

SAME

SOLE

SONG

TALC

UNIT

UNUM

UNUS



5 Character Answers:

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ACTER

ADMIT

ALONE

ARISE

CUBER

DIGIT

EQUAL

EVENS

FIBER

LONER

ONEBY

ORTWO

SIXOF

SROOT

TENTO

TWOTO

WORLD



6 Character Answers:

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ANDALL

CAGNEY

HOLEIN

MARINE

NATION

NUMBER

PERSON

UNITED



7 Character Answers:

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ATATIME

INTEGER

UNIFIED

VALENCE



8 Character Answers:

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CARDINAL

CUBEROOT

MANSMEAT



9 Character Answers:

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LUNCHTIME

NUMERATOR



10 Character Answers:

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NIGHTSTAND



11 Character Answers:

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ACHTUNGBABY

THATGOTAWAY



13 Character Answers:

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OPENINGNUMBER

OPENINGNUMBER



14 Character Answers:

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TOOKFIRSTPRIZE



15 Character Answers:

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ALOTONONESPLATE

LONELIESTNUMBER

TENDERLOINSTEAK

TWOBUCKLEMYSHOE