Patron saint of innkeepers and French disciplinarian (8)

I believe the answer is:

martinet

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'disciplinarian' is the definition.
(I know that disciplinarian can be written as martinet)

I don't understand the remainder of the clue.

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(Other definitions for martinet that I've seen before include "Strict disciplinarian - met train (anag)" , "One demands exact conformity to rules" , "drillmaster" , "'Disciplinarian, exacts strict conformity to rules (8)'" , "Despot" .)

I've seen this clue in The Irish Independent.

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