He cast out bag (6)
I believe the answer is:
sachet
'bag' is the definition.
(I know that Sachet is a type of bag)
'he cast out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'he'+'cast'='hecast'
'hecast' anagrammed gives 'SACHET'.
(Other definitions for sachet that I've seen before include "Small soft bag, containing perfumed powder perhaps" , "Small packet (of, eg, shampoo)" , "Scent bag - shampoo envelope" , "Small sealed packet" , "Small soft container -- a chest (anag)" .)