Crossword Genius

Respiratory organ (4)

Ross

I believe the answer is:

lung

'respiratory organ' is the definition.
(I know that Lung is a type of respiratory organ)

This is the entire clue.

(Other definitions for lung that I've seen before include "Respiratory organ" , "Air bag?" , "breather" , "Organ used for breathing" , "One of a pair of organs in the ribcage" .)

I've seen this clue in the Penny Press, The Irish Times, the USA Today, the LA Times, The Star Tribune, the Sydney Morning Herald, The Times and The Sun.
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