Crossword Genius

Aider and abettor; add-on (9)

Ross

I believe the answer is:

accessory

(Other definitions for accessory that I've seen before include "Item such as a handbag that goes with a dress" , "One assisting a crime" , "Kind of accomplice or clothes add-on" , "Confederate" , "Useful added item" .)

I've seen this clue in The Guardian.
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