Crossword Genius

Sound wanting almost everything expelled from lungs? (6)

Ross

I believe the answer is:

bellow

I'm a little stuck... Click here to teach me more about this clue!

'almost everything expelled from lungs?' is the definition.
I can't tell whether this defines the answer.

'sound wanting' is the wordplay.
'sound' becomes 'bell' (bell is a kind of sound).
'wanting' becomes 'ow' (I can't explain this - if you can you should give a lot more credence to this answer).
'bell'+'ow'='BELLOW'

Can you help me to learn more?

(Other definitions for bellow that I've seen before include "Roar, shout" , "Loud and deep roar" , "Roar like a bull" , "Deep roar as of bull" , "Yell" .)

I've seen this clue in The Telegraph.
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