Crossword Genius

Person very like a campanologist (6)

Ross

I believe the answer is:

ringer

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'campanologist' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ringer that I've seen before include "One making the toll" , "One calling" , "match" , "See 22" , "Doppelganger" .)

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