Singletons (4)

I think it could be either:

Which length description are you looking for?:

6,6

ones

'singletons' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ones that I've seen before include "Individuals" , "Units" , "1 & 1 & 1" , "Singletons" , "Aces" .)

I've seen this clue in The Irish Times.

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