Blunder dividing odd case also containing new wine from Loire valley (8)
I believe the answer is:
sancerre
'wine from loire valley' is the definition.
'Sancerre' can be an answer for 'wine' (I've seen this before). I am unsure of the 'from loire valley' bit.
'blunder dividing odd case also containing new' is the wordplay.
I cannot quite understand how this works, but
'blunder' could be 'err' (to err is to make a mistake or blunder) and 'err' is found within the answer.
'new' could be 'n' (common abbreviation eg NT for New Testament) and 'n' is present in the answer.
an anagram of 'case' is 'sace' which is located in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sancerre that I've seen before include "Type of French white wine" , "Light French white wine" .)