Wife of Cronus and mother of Zeus in Greek mythology (4)

I believe the answer is:

rhea

(Other definitions for rhea that I've seen before include "Flightless bird from South America" , "Flightless bird - Greek fertility goddess" , "Big bird" , "New World ostrich" , "Ostrich-like bird of South America" .)

I've seen this clue in The Mirror.

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