Crossword Genius

Whose part in drama is telling? (8)

Ross

I believe the answer is:

narrator

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'telling?' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

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

Can you help me to learn more?

(Other definitions for narrator that I've seen before include "Commentator" , "He tells the story - arrant or what?" , "reporter" , "The one who tells the story" , "One who tells the tale" .)

I've seen this clue in The Sun.
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