Crossword Genius

Of sound mind (4)

Ross

I think it could be either:

sane

lung

'of sound mind' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for lung that I've seen before include "Organ used for breathing" , "breather" , "Of sound mind" , "Breathing apparatus" , "Air bag?" .)

I've seen this clue in the Evening Standard, the LA Times, The Mirror, the Newsday, The Times, The Star Tribune and The Independent.
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