Crossword Genius

Two kinds of brush (5)

Ross

I believe the answer is:

scrub

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'brush' is the definition.
(scrub brush is a kind of brush)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for scrub that I've seen before include "insignificant type" , "Take out - clean" , "Area of dense stunted vegetation" , "Discontinue" , "remove cosmetic" .)

I've seen this clue in The Telegraph.
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