Fish has a certain style (6)
I believe the answer is:
mullet
I believe this is a double definition.
'fish' is the first definition.
(mullet is a kind of fish)
'a certain style' is the second definition.
(hair style)
'has' acts as a link.
(Other definitions for mullet that I've seen before include "swimmer" , "Barnet?" , "Starfish" , "Fish - bad haircut" , "Fish (red or grey)" .)