Crossword Genius

Potentate with only one foot? (5)

Ross

I believe the answer is:

ruler

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'potentate' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ruler that I've seen before include "Emperor - measure" , "Despot perhaps" , "One exercising control" , "King or, president, say" , "It can be used to strike" .)

I've seen this clue in the Evening Standard.
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