Wrongly attended a baddie (5,3,7)

I believe the answer is:

aided and abetted

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'wrongly attended a baddie' is the definition.
I can't judge whether this definition defines the answer.

'wrongly attended a baddie' is the wordplay.
'wrongly' indicates an anagram (I've seen this in other clues).
'attended'+'a'+'baddie'='attendedabaddie'
'attendedabaddie' is an anagram of 'AIDED AND ABETTED'.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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