George, for example, unites two men - its an awful mistake (6,5)

I believe the answer is:

patron saint

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'george for example' is the definition.
(I know that Saint George is a patron saint)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for patron saint that I've seen before include "Matthew, of tax collectors; Luke, of physicians, etc" , "Religious guardian" , "Unearthly guardian" , "Andrew for Scotland, for example" , "For example, George" .)

I've seen this clue in The Irish Independent.

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