Countryman may help you when lost (8)
I believe the answer is:
landmark
'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" .)