Crossword Genius

Line of equal pressure (6)

Ross

I believe the answer is:

isobar

'line of equal pressure' 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 showing points having equal barometric pressure at a given time" , "As brio (anag)" , "Line joining places of equal barometric pressure" , "Pressure line on a weather map" , "depression indicator?" .)

I've seen this clue in The Mirror.
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