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All answers having "Bills" as clue:

4 Character Answers:

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CASH

MAIL

NEBS

NIBS

ONES

TABS

TENS



5 Character Answers:

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BEAKS

DEBTS

FIVES



6 Character Answers:

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CNOTES

POSTNO



7 Character Answers:

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DOLLARS

NFLTEAM

POSTERS

PROTEAM



8 Character Answers:

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INVOICES

PLACARDS



10 Character Answers:

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PAPERMONEY



12 Character Answers:

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FOLDINGMONEY



15 Character Answers:

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BRADLEYANDCOSBY

CLINTONANDGATES

MURRAYANDMONROE