Crossword Genius

Rail construction (4)

Ross

I believe the answer is:

nest

'rail construction' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for nest that I've seen before include "Bird shelter" , "Shelter in which to lay eggs" , "Place of retreat" , "In which to lay eggs or give birth" , "Casually thrown" .)

I've seen this clue in The New York Times.
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