A supporter who arouses enthusiasm (11)

I believe the answer is:

cheerleader

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'a supporter' is the definition.
(I know that cheerleader is a type of supporter)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for cheerleader that I've seen before include "Enthusiastic type" , "Orchestrator of applause" , "Support director" , "Organiser of support for a sports team" , "figure offering vocal support?" .)

I've seen this clue in The Globe and Mail.

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