Queen of Sparta in Greek mythology; mother of Helen by Zeus (4)

I believe the answer is:

leda

(Other definitions for leda that I've seen before include "small satellite of Jupiter" , "Zeus turned into a swan to seduce her" , "Mother of Helen and Pollux" , "Queen of Sparta, mother of Helen of Troy" , "- - and the Swan (mythology)" .)

I've seen this clue in The Mirror.

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