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Field division that takes years to train (8)

Ross

I believe the answer is:

hedgerow

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This could be a double definition.

'field division that takes years' is the first definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

'train' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'to' is the link.

Can you help me to learn more?

(Other definitions for hedgerow that I've seen before include "natural fence" , "Line of shrubs as barrier" , "Bushy boundary" , "Living boundary between fields" , "Line of entwined bushes and trees" .)

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