Crossword Genius

Map line (6)

Ross

I think it could be either:

isobar

street

'map line' is the definition.
(line indicating pressure on a map)

This is the entire clue.

(Other definitions for isobar that I've seen before include "Line on map showing barometric pressure" , "Weather map feature" , "meteorologist's line" , "Line on map showing atmospheric pressure" , "Line connecting points of equal air pressure" .)

I've seen this clue in the Sydney Morning Herald and The Telegraph.
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