Binary digits (4)

I think it could be either:

Which length description are you looking for?:

ones

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

This is the entire clue.

(Other definitions for ones that I've seen before include "Units" , "(Of ship) returning to port of origin" , "1 & 1 & 1" , "Singles" , "Individuals" .)

I've seen this clue in the LA Times.

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