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All answers having "3" as clue:

3 Character Answers:

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AVG

CAL

DEF

GCD

III

KIL

MAR

MMM

ORA

PAR

TRE

TUT



4 Character Answers:

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CUBE

HOUR

LOAD

NILE

PARS

SECS

SOOT

TREY

WIRE



5 Character Answers:

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HEART

HEURE

LEAST

MMMDC

TORTE



6 Character Answers:

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DINGUS

KALINE



7 Character Answers:

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ECSTASY

LINEARB

ONEHOUR

TWOMILE



8 Character Answers:

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CLEMENTE

CUBEROOT

HATTRICK



9 Character Answers:

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DRESSSIZE

POUNDSIGN

SPACEMARK



10 Character Answers:

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CHALLENGER

CHANGJIANG

GUNCALIBER

SEVENHCLUB

SQUAREROOT

TWOPLUSONE



15 Character Answers:

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SIXDIVIDEDBYTWO

XSQUAREDPLUSTWO