Addresses nun eating fish, to get salt cellar (6)
I believe the answer is:
shaker
'salt cellar' is the definition.
(I've seen this in another clue)
'addresses nun eating fish' is the wordplay.
'addresses nun' becomes 'sr' (I can't explain this - if you can you should give a lot more credence to this answer).
'eating' means one lot of letters goes inside another.
'fish' becomes 'hake' (type of fish).
'sr' enclosing 'hake' is 'SHAKER'.
'to get' acts as a link.
Can you help me to learn more?
(Other definitions for shaker that I've seen before include "Cocktail mixer" , "Salt cellar" , "Member of American Christian sect" , "Container to make a cocktail" , "Member of ecstatic sect" .)