Fish of questionable style (6)
I believe the answer is:
mullet
This might be a double definition.
'fish' is the first definition.
(mullet is a kind of fish)
'questionable style' is the second definition.
'mullet' can be an answer for 'style' (I've seen this before). I am not certain of the 'questionable' bit.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for mullet that I've seen before include "swimmer" , "Food fish - hairstyle" , "Fish; man's hair style" , "Fish (red or grey)" , "Fish, male hairstyle" .)