True, the ring wasn't built for fighting with, but it may have still helped Gandalf by lending some of the stored power of the elf-magic that went into it's making. Gandalf was a wise and quite powerful maia, and I am sure that, given this extra power, he would be able to bend it to aid him somewhat in fighting the Balrog.
The 'Flame of Anor' could be just a cause.
Flame of Udun - he dark cause of Morgoth/Sauron.
Flame of Anor - the cause of the sun, the 'light' cause of the West.
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