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 the cause that Gandalf fought for.
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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