Manhattan's ____ Avenue is part of its West Side Highway (7)

I believe the answer is:

twelfth

(Other definitions for twelfth that I've seen before include ""Drummers drumming" day of Christmas" , "One, of a dozen" , "Northern Ireland's big July day" , "Sewn join" , "July day celebrated by northern Unionists" .)

I've seen this clue in The Times.

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