Wine cash bill is incorrect - fifty short (7)
I believe the answer is:
chablis
'wine' is the definition.
(Chablis is an example)
'cash bill is incorrect fifty short' is the wordplay.
I cannot really see how this works, but
'cash' could be 'l' (The pound sterling symbol is an elaborate L) and 'l' is located in the answer.
'is' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chablis that I've seen before include "Burgundy town and white wine" , "Classic white wine from Burgundy" , "French dry white wine" , "Dry Burgundy wine" , "Town in north central France noted for white Burgundy wines" .)