Good evidence of impact around the city area (6)

I believe the answer is:

decent

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'good' is the definition.
(thesaurus)

'evidence of impact around the city area' is the wordplay.
'evidence of impact' becomes 'dent' (I can't explain this - if you can you should give a lot more credence to this answer).
'around' indicates putting letters inside.
'the city area' becomes 'EC' (EC is a London postcode area).
'dent' enclosing 'ec' is 'DECENT'.

Can you help me to learn more?

(Other definitions for decent that I've seen before include "Modest or kind" , "Obliging or modest" , "Generally acceptable" , "Pretty good - not naked" , "Presentable" .)

I've seen this clue in the Evening Standard.

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