Inform police about Cath being super critical (8)

I believe the answer is:

scathing

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'super critical' is the definition.
I can't judge whether this definition defines the answer.

'inform police about cath' is the wordplay.
'inform police' becomes 'sing' (I can't justify this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'sing' going around 'cath' is 'SCATHING'.

'being' acts as a link.

Can you help me to learn more?

(Other definitions for scathing that I've seen before include "Acid" , "Caustic" , "Sarcastic" , "Painful" , "Harshly critical" .)

I've seen this clue in the Sydney Morning Herald.

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