From Longman Dictionary of Contemporary Englishas is somebody’s wontas is somebody’s wont old-fashionedUSUALLYused to say that it is someone’s habit to do something He spoke for too long, as is his wont. → wont
Examples from the Corpus
as is somebody’s wont• As was his wont, Churchill drank scotch with water, but no ice.• Organic causes were ruled out so, as is his wont, he sat down and talked to her. 