Crossword Genius

One of those teaching a lesson to voter needs no introduction (6)

Ross

I believe the answer is:

lector

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'one' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

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

Can you help me to learn more?

(Other definitions for lector that I've seen before include "Person reading lessons in church" , "one reads" , "Reader, esp. in church" , "Reader at certain universities" , "Hannibal - -" .)

I've seen this clue in the Irish Times.
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