Wine one is mad about at middle-age? (6)
I believe the answer is:
graves
'wine' is the definition.
(wine from the Graves region in France)
'one is mad about at middle-age?' is the wordplay.
'one is mad about' becomes 'raves' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'at' says to put letters next to each other (I've seen this in other clues).
'middle' indicates the central letters.
The middle letter of 'age' is 'g'.
'raves' put after 'g' is 'GRAVES'.
Can you help me to learn more?
(Other definitions for graves that I've seen before include "A Bordeaux wine" , "Scots garment" , "Wine - English poet - tombs" , "French wine region" , "White wine - found in churchyard" .)