Crate containing second part needed for pot (9)
I believe the answer is:
casserole
'for pot' is the definition.
(type of cooking pot)
'crate containing second part' is the wordplay.
I cannot really understand how this works, but
'second' could be 's' (common abbreviation) and 's' is present in the answer.
'part' could be 'role' (eg a theatrical role) and 'role' is found within the answer.
The remaining letters 'case' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'needed' acts as a link.
Can you help me to learn more?
(Other definitions for casserole that I've seen before include "Slow-cooked dish" , "Make a stew" , "Stew; dish" , "Stew-pan" , "(Food cooked in a) stewpot" .)