Crossword Genius

Air pressure (6)

Ross

I believe the answer is:

strain

This clue is a double definition.

'air' is the first definition.
(I know that air can be written as strain)

'pressure' is the second definition.
(I've seen this before)

(Other definitions for strain that I've seen before include "song" , "In arts (anag)" , "Tension - stock" , "Pressure - filter" , "Struggle" .)

I've seen this clue in the Financial Times and the Evening Standard.
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