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From the air, glass oddly is a chemical weapon (4,3)

Ross

I think it could be either:

Which length description are you looking for?:

7

4,3

teargas

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'chemical weapon' is the definition.
(I know that teargas is a type of chemical weapon)

'from the air glass oddly is a' is the wordplay.
I cannot quite understand how this works, but
'from' could be 'e' (I've seen this in other clues) and 'e' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'air' could be 'gas' (I've seen this in other clues) and 'gas' is located in the answer.
'a' is within the answer.
A single letter 'r' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Guardian.
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