Notes from Limmud 2005: Judith the Obscure

( Okay, it's the wrong Yom Tov, but it was topical at Limmud! )

The Riddle

Near a tree by a river
There's a hole in the ground
Where an old man of Arran
Goes around and around
And his mind is a beacon
In the veil of the night
For a strange kind of fashion
There's a wrong and a right
But he'll never, never fight over you

All right, I give up (twenty-one years is a reasonable amount of time to spend scratching my head over it, I reckon!); what's it mean?