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Countryman may help you when lost (8)

Ross

I believe the answer is:

landmark

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'countryman' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for landmark that I've seen before include "Durham Cathedral, say" , "Notable geographical feature" , "of great significance" , "Easily identifiable monument, for example" , "Shard, for example" .)

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