Bag carried by this accomplice (3)
I believe the answer is:
sac
'bag' is the definition.
(a small bag)
'carried by this accomplice' is the wordplay.
'carried by' indicates the answer is hidden within the clue.
'SAC' is hidden in the letters of 'this accomplice'.
(Other definitions for sac that I've seen before include "Pouch in the body" , "Membranous cavity" , "Bag-like part in animal or plant" , "Bag-like part of the body" , "Animal or vegetable pouch" .)