Pastry dish, and some filling (6)
I believe the answer is:
danish
'pastry' is the definition.
(I know that Danish is a type of pastry)
'dish and some filling' is the wordplay.
'dish' indicates anagramming the letters (dish can informally mean to destroy).
'some filling' becomes 'ish' (I can't justify this - if you can you should give a lot more credence to this answer).
'and' is an anagram of 'dan'.
'dan'+'ish'='DANISH'
Can you help me to learn more?
(Other definitions for danish that I've seen before include "Pastry, from Copenhagen say" , "A blue cheese; a pastry" , "Nice pastry from Copenhagen" , "Language of Denmark" , "Like Hans Andersen" .)