Disorder about marine creature disposing of a shellfish (7)
I believe the answer is:
mussels
'shellfish' is the definition.
(I've seen this before)
'disorder about marine creature disposing of a' is the wordplay.
I cannot quite understand how this works, but
'disorder' could be 'muss' (muss is a kind of disorder) and 'muss' is found within the answer.
The remaining letters 'els' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for mussels that I've seen before include "Shellfish" , "Black marine bivalves" .)