All off, presumably, to see old president (5)

I believe the answer is:

nixon

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'president' is the definition.
(Richard Nixon)

I don't understand the remainder of the clue.

(Other definitions for nixon that I've seen before include "Richard -, US president who resigned in nineteen seventy four" , "Watergate US president" , "Watergate was his downfall" , "US president, d.1994" , "Disgraced US president" .)

I've seen this clue in The Times.

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