Wine studied, we hear? (3)
I believe the answer is:
red
'wine' is the definition.
(red wine is an example)
'studied we hear?' is the wordplay.
'studied' becomes 'read' (I've seen this in other clues).
'we hear?' shows a homophone (sound like).
'read' sounds like 'RED'.
(Other definitions for red that I've seen before include "Type of wine" , "eg Cardinal" , "Colour of a cardinal's hat" , "Blood-coloured" , "Colour of garnets" .)