Sister of Helios (6)

I think it could be either:

Which length description are you looking for?:

eos

'sister of helios' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eos that I've seen before include "Greek god of the dawn" , "Greek dawn goddess" .)

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

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