Crossword Genius

Additional individual abetting criminal (9)

Ross

I believe the answer is:

accessory

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'additional' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for accessory that I've seen before include "Useful added item" , "Someone who helps another commit a crime" , "Supplementary item" , "Item such as a handbag that goes with a dress" , "Criminal's helper" .)

I've seen this clue in The Telegraph.
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