Crossword Genius

What could create hard border? (5)

Ross

I believe the answer is:

hedge

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'hard border?' is the definition.

I don't understand the remainder of the clue.

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(Other definitions for hedge that I've seen before include "Shrubby boundary" , "cover?" , "Field barrier" , "Beg the question" , "Fence formed by bushes" .)

I've seen this clue in The Telegraph.
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