Wrongly accept to be an accident (7)

I believe the answer is:

mistake

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'accident' is the definition.
(thesaurus)

'wrongly accept' is the wordplay.
'wrongly' becomes 'mis' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'accept' becomes 'take' (to accept is to take possession of).
'mis'+'take'='MISTAKE'

'to be an' is the link.

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(Other definitions for mistake that I've seen before include "Oversight" , "Fault" , "16 down" , "Wrong action or judgment" , "Error" .)

I've seen this clue in the Evening Standard.

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