Soup container, usually numbered (4)
I believe the answer is:
opus
'container usually numbered' is the definition.
I can't tell whether this defines the answer.
'soup' is the wordplay.
'soup' can be anagrammed to 'OPUS'.
Though, I'm not clear how this is indicated.
Can you help me to learn more?
(Other definitions for opus that I've seen before include "Composition - magnum __" , "(Numbered) musical composition" , "Showing creative skill" , "Composer's catalogue number" , "Work or composition, usually musical" .)