It's great to get away with overcharging! (7,3)

I believe the answer is:

ripping off

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'overcharging' is the definition.
Although both the answer and definition are present participle verbs, I cannot understand how one could define the other.

'it's great to get away' is the wordplay.
'it's great' becomes 'ripping' (I can't justify this - if you can you should give a lot more credence to this answer).
'to get' means one lot of letters go next to another.
'away' becomes 'off' (synonyms).
'ripping'+'off'='RIPPING OFF'

'with' acts as a link.

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I've seen this clue in the Evening Standard.

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