Crossword Genius

CIA meeting with Boris for a change, levelly maintaining pressure (8)

Ross

I believe the answer is:

isobaric

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'levelly maintaining pressure' is the definition.
(isobaric means with a constant level of pressure)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for isobaric that I've seen is " of atmospheric contours".)

I've seen this clue in The Independent.
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