Governor acting for a sovereign (7)

I believe the answer is:

viceroy

(Other definitions for viceroy that I've seen before include "Ruler of a colony" , "Monarch's plenipotentiary - American butterfly, like (but smaller than) a monarch" , "One ruling in a colony" , "sovereign's governor" , "Sovereign's representative in a colony" .)

I've seen this clue in The Telegraph and The Times.

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