Emperor of Austria or Germany until 1918 (6)

I believe the answer is:

kaiser

'emperor of austria or germany until 1918' is the definition.
(I've seen this before)

This is all the clue.

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

I've seen this clue in The Irish Times.

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