Margin for error in map-making? (8)
I believe the answer is:
latitude
'margin' is the definition.
(thesaurus)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for latitude that I've seen before include "Imaginery line around the earth" , "of which people in Ecuador have very little" , "range" , "Poles' approach increases such" , "Freedom from restriction" .)