Crossword Genius

Rail construction (4)

Ross

I believe the answer is:

nest

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rail construction</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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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