Students oddly silent around fish (6)

I believe the answer is:
mullet
'fish' is the definition.
(mullet is a kind of fish)
'students oddly silent' is the wordplay.
I cannot quite see how this works, but
'students' could be 'll' (two abbreviations for learner) and 'll' is found within the answer.
This explanation may well be incorrect...
'around' acts as a link.
Can you help me to learn more?
(Other definitions for mullet that I've seen before include "Food fish - hairstyle" , "Fish (red or grey)" , "Starfish" , "Barnet?" , "Fish, male hairstyle" .)
