Genesis matriarch (4)
I believe the answer is:
leah
'genesis matriarch' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for leah that I've seen before include "her elder sister" , "Rachel's sister" , "Jacob's first wife (Bible)" , "Hale (anag) - wife of Jacob" , "First wife of Jacob" .)