Al best at changing aids in criminal acts (8)

I believe the answer is:

abettals

I'm a little stuck... Click here to teach me more about this clue!

'aids in criminal acts' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'al best at changing' is the wordplay.
'changing' indicates an anagram.
'al'+'best'+'at'='albestat'
'albestat' anagrammed gives 'ABETTALS'.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

Want a hint initially instead of a full solution? Install my app