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All answers having "Bum" as clue:

3 Character Answers:

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ASS

RAP



4 Character Answers:

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ARSE

HOBO

REAR

TUSH



5 Character Answers:

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ARIDE

CADGE

LOUSY

MOOCH

STEER

TRAMP



6 Character Answers:

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BORROW

BOTTOM

HEINIE

NOGOOD

SPONGE



7 Character Answers:

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GOODNIK

REAREND



8 Character Answers:

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FREELOAD

PATOOTIE

SCROUNGE

VAGABOND



9 Character Answers:

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NOGOODNIK



10 Character Answers:

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NEERDOWELL