Half and half? (3)

I think it could be either:

Which length description are you looking for?:

1,2

one

'half and half?' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for one that I've seen before include "If upper-class, perhaps I" , "Individual" , "Half of two" , "1" , "Single, sole" .)

I've seen this clue in the Universal, The Irish Independent, The New York Times, the LA Times and The Wall Street Journal.

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