Fried stuff with uniform filling (5)
I believe the answer is:
saute
'fried' is the definition.
(saute can mean fried quickly)
'stuff with uniform filling' is the wordplay.
'stuff with' becomes 'sate' (I've seen this in another clue. I am not sure about the 'with' bit.).
'uniform' becomes 'U' (phonetic alphabet: alpha, bravo, charlie etc.).
'filling' means one lot of letters goes inside another.
'sate' enclosing 'u' is 'SAUTE'.
(Other definitions for saute that I've seen before include "Fried quickly in a little fat" , "Fried food" , "Fry lightly" , "Fry quickly in hot fat" , "Cook" .)