Thomas —, author of novels Buddenbrooks and The Magic Mountain (4)

I believe the answer is:

mann

(Other definitions for mann that I've seen before include "Thomas -, Ger. author (Death in Venice)" , "Keyboard player Manfred" , "Poor dwelling" , "Thomas -, Twentieth Century German author (Death in Venice)" , "Foreign author" .)

I've seen this clue in The Mirror.

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