Fish sandwiches staff put round plates (7)
I believe the answer is:
enamels
'round plates' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'fish sandwiches staff' is the wordplay.
'fish' becomes 'eels' (eel is a type of fish).
'sandwiches' is an insertion indicator (inserted letters are sandwiched in).
'staff' becomes 'nam' (I can't explain this - if you can you should give a lot more credence to this answer).
'eels' going around 'nam' is 'ENAMELS'.
'put' is the link.
Can you help me to learn more?
(Other definitions for enamels that I've seen before include "hard-wearing coats" , "coat" , "Paints" .)