Crude and underdeveloped, with excellent content (9)
I believe the answer is:
unrefined
'crude' is the definition.
(I know that crude can be written as unrefined)
'underdeveloped with excellent content' is the wordplay.
I cannot quite understand how this works, but
'excellent' could be 'fine' (synonyms) and 'fine' is located in the answer.
The remaining letters 'unred' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'and' acts as a link.
(Other definitions for unrefined that I've seen before include "Crude" , "Coarse" , "Rough" , "rude" .)