Being critical is hard, generating friction around it (10)

I believe the answer is:

rubbishing

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'being critical is hard generating' is the definition.
I can't judge whether this defines the answer.

'friction around it' is the wordplay.
'friction' becomes 'rubbing' ('rubbing' can be a synonym of 'friction').
'around' is an insertion indicator.
'it' becomes 'ish' (I can't explain this - if you can you should give a lot more credence to this answer).
'rubbing' placed around 'ish' is 'RUBBISHING'.

Can you help me to learn more?

I've seen this clue in The Independent.

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