Mashed pea with everything around dish (6)
I believe the answer is:
'dish' is the definition.
(type of meal)
'mashed pea with everything around' is the wordplay.
'mashed' indicates anagramming the letters.
'with' says to put letters next to each other.
'everything' becomes 'all' (all things).
'around' says the letters should be written backwards.
'all' reversed gives 'lla'.
'pea' with letters rearranged gives 'pae'.
(Other definitions for paella that I've seen before include "Spanish dish of rice, chicken, seafood etc cooked in a pan" , "Spanish dish based on saffron rice" , "Saffron-flavoured rice dish" , "Spanish dish of rice, shellfish, etc" , "Make stew" .)