This is the version that I know:

Oh, my lovely Rose of Clare, you're the sweetest girl I know.
You're the queen of all the roses, like the pretty flowers that grow.
You are the sunshine of my life, so beautiful and fair,
For I will always love you, my lovely Rose of Clare.

The sun it shone down like a jewel on the lovely hills of Clare
When I strolled along with my sweet love one evening at the fair.
Her eyes they shone like silver streams with her long, long golden hair,
For I have stolen the heart of one, my lovely Rose of Clare.

We walked down by the riverbank where the lovely Shannon glides
And listened to the nightingale, singing songs for you and I.
And now to say goodbye, farewell, to all you people there,
For I have stolen the heart of one, my lovely Rose of Clare.

That's about the best I can do!
All the best,
Frank