German emperor (6)

I believe the answer is:

kaiser

'german emperor' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for kaiser that I've seen before include "Former German emperor" , "Ruler over empire" , "Ex-ruler of Germany" , "Austrian bigwig" , "Old German emperor like Bill" .)

I've seen this clue in The Guardian, The Telegraph, The Times and the Sydney Morning Herald.

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