Mammary passageway (4)

I believe the answer is:

duct

(Other definitions for duct that I've seen before include "Tube for cables, air, etc" , "Pipe for cables or air" , "Tube for conveing cable, liquid etc" , "The Eve of St - is a narrative poem by Keats" , "Pipe, tube" .)

I've seen this clue in the USA Today.

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