Raised lighter alcoholic content of red wine (6)
I believe the answer is:
claret
'red wine' is the definition.
(I know that claret is a type of red wine)
'raised lighter alcoholic content' is the wordplay.
'raised' says the letters should be written backwards (going up in a down clue).
'content' indicates the answer is hidden within the clue (letters contained within the clue).
'teralc' can be found hidden inside 'lighter alcoholic'.
'teralc' back-to-front is 'CLARET'.
'of' acts as a link.
(Other definitions for claret that I've seen before include "drink" , "Cartel for Bordeaux red wine" , "Deep purplish colour" , "Alcohol" , "Irish county starts the wine" .)