German theologian who led the Protestant Reformation (6)

I believe the answer is:

luther

(Other definitions for luther that I've seen before include "German theologian who led the Reformation, d. 1546" , "turbulent priest" , "Martin . . . . . ., founder of Protestant Reformation in Germany" , "Martin -, Protestant theologian" , "Martin -, C fifteen-sixteen German Protestant reformer" .)

I've seen this clue in The Times.

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