Crossword Genius

Scrub either of two ex-Presidents (4)

Ross

I believe the answer is:

bush

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'scrub' is the definition.
(I know that scrub can be written as bush)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for bush that I've seen before include "Outback" , "part of shrubbery" , "Shrub; US president" , "Rural African" , "ex-president" .)

I've seen this clue in The Guardian.
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