Crossword Genius

Sub

Ross

There are a few possibilities for this:

Which length description are you looking for?:

1-4 4,2

9*

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

This is all the clue.

(Other definitions for alternate that I've seen before include "In turns, first one then the other" , "Interchange" , "Happen in turns, rotate" , "Change repeatedly between two" , "Happening or following in turns, one after the other" .)

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