John acted with true grit (5)

I believe the answer is:

wayne

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'john' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

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

Can you help me to learn more?

(Other definitions for wayne that I've seen before include "John --, film star" , "John ....., later hero of western films" , "See seventeen accross" , "- - 's World (film)" , "Batman was Bruce -" .)

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