Egyptian goddess whose headdress in some depictions is a sun disc between cow horns (4)

I believe the answer is:

isis

(Other definitions for isis that I've seen before include "Sister of Osiris" , "Egyptian goddess and jihadist group" , "Repetitive Egyptian goddess" , "where one might take a punt" , "Wife of Osiris" .)

I've seen this clue in The Times.

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