Broadway? (6)

I believe the answer is:

avenue

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

This is all the clue.

Can you help me to learn more?

(Other definitions for avenue that I've seen before include "A line of approach" , "Wide street or road as in New York" , "Wide (tree-lined) street" , "Way of approach" , "A broad wide street" .)

I've seen this clue in The Sun.

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