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All answers having "O" as clue:

3 Character Answers:

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GIE

HUG

IAM

LIT

MAB

MAG

NIL

OMG

SEE

YEN



4 Character Answers:

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ALER

ARED

ATOP

BANG

HAST

HIRE

IAGO

LASS

LEAR

LEST

NONE

OBOE

RING

TYPE

YEOF



5 Character Answers:

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AHOME

ALAMO

ATOMS

DADDY

DONOR

FLESH

HEART

HENRY

LETIT

OMEGA

OPRAH

OSCAR

OUGHT

PSALM

ROMEO

SIGMA

TWERE

WEREI

ZILCH



6 Character Answers:

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CIPHER

EUROPA

OMAHAS

OXYGEN



7 Character Answers:

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LOYALTY

MADNESS

OMICRON

OPHELIA



8 Character Answers:

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COMPUTER

HULAHOOP

OPERATOR



9 Character Answers:

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DAHDAHDAH

POUNDSIGN



10 Character Answers:

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BLOODGROUP

LOVELETTER



11 Character Answers:

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PHOTOFINISH

ROBERTBURNS

STORMCENTER



12 Character Answers:

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BOZOTHECLOWN

SECONDTONONE



13 Character Answers:

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BRAVENEWWORLD



14 Character Answers:

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ARABICNUMERALS



15 Character Answers:

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BEETHOVENSSIXTH

CHEMISTRYSYMBOL

COMMONBLOODTYPE

CONTRACTIONOFOF

FIFTEENTHLETTER

IRISHNAMEPREFIX

MIDDLEOFOCTOBER

OHIOABBREVIATED

OHMABBREVIATION

SECONDINCOMMAND

SUFFIXWITHRIGHT

SYMBOLFOROXYGEN

WORDINMANYHYMNS



21 Character Answers:

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LITTLETOWNOFBETHLEHEM