Crossword Genius

Temporary ruler (6,6)

Ross

I believe the answer is:

prince regent

(Other definitions for prince regent that I've seen before include "The future George IV in 1811-20" , "George IV, before he became King" , "George III's son was one such" , "As George IV was during eighteen eleven - eighteen twenty" .)

I've seen this clue in The Guardian.
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