Role played in "The Letter"? (9)

I believe the answer is:

character

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'role' is the definition.
(I know that role can be written as character)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for character that I've seen before include "I, for example" , "Letter; personality" , "constitution" , "Amusing individual" , "Letter or number" .)

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