A red or white mark intended to deceive (5)
I believe the answer is:
macon
'a red' is the definition.
(type of red wine)
'white mark intended to deceive' is the wordplay.
I cannot really see how this works, but
'mark' could be 'm' and 'm' is located in the answer.
'deceive' could be 'con' (I've seen this in another clue) and 'con' is found in the answer.
A single letter 'a' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'or' is the link.
Can you help me to learn more?
(Other definitions for macon that I've seen before include "Dry white Burgundy wine" , "Wandering (knight)" , "French wine district" , "A heavy Burgundy" , "red" .)