Crossword Genius

It may contain a slow-growing shrub (3)

Ross

I believe the answer is:

box

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'shrub' is the definition.
(box is a kind of shrub)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for box that I've seen before include "Punch" , "Tackle defender" , "Fight; tree; container" , "Engage in pugilism" , "Topiary shrub" .)

I've seen this clue in The Globe and Mail.
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