I want to say Isis.
Ouse
flower is the definition meaning river (one that flows).
A bog might ooze, and "I heard" signifies "sounds like".
Hence Ouse (the river through York).
if you read stems as "comes" (as in the ancestral sense) the the clue reads as: River comes from ooze, I heard
@wence started
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I want to say Isis.