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All answers having "Supporter" as clue:

3 Character Answers:

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AYE

BRA

FAN

LEG

PRO



4 Character Answers:

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ALLY

CANE



5 Character Answers:

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AIDER



6 Character Answers:

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APLOMB

BACKER

GARTER

PATRON

ROOTER



7 Character Answers:

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BOOSTER

SPONSOR



8 Character Answers:

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ADHERENT

ADVOCATE

ASSISTER

BACKREST

PARTISAN



10 Character Answers:

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BENEFACTOR



11 Character Answers:

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SYMPATHIZER