Verbal instruction to infuse red wine for fish (6)
I believe the answer is:
mullet
'fish' is the definition.
(mullet is a kind of fish)
I don't understand how the rest of the clue works.
(Other definitions for mullet that I've seen before include "Starfish" , "Fish - bad haircut" , "Barnet?" , "Fish, male hairstyle" , "Fish; man's hair style" .)