Too much talk of breaking asunder (3)

I believe the answer is:

gas

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'too much talk' is the definition.
'gas' can be an answer for 'talk' (gas can mean to chat). I am not sure about the 'too much' bit.

'of breaking asunder' is the wordplay.
'of' indicates a hidden word.
'GAS' is hidden within 'breaking asunder'.

Can you help me to learn more?

(Other definitions for gas that I've seen before include "eg Helium" , "16 (US)" , "Piped fuel" , "Fumes, vapour" , "that may quickly be stepped on" .)

I've seen this clue in the Evening Standard.

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