European dessert mostly filled with last of bread (5)
I believe the answer is:
swede
'european' is the definition.
(Swede is an example)
'dessert mostly filled with last of bread' is the wordplay.
'dessert' becomes 'sweet' ('sweet' can be a synonym of 'dessert').
'mostly' means to remove the last letter.
'filled with' means one lot of letters goes inside another.
'last of bread' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'sweet' with its last letter removed is 'swee'.
'swee' placed around 'd' is 'SWEDE'.
Can you help me to learn more?
(Other definitions for swede that I've seen before include "N European" , "Nobel for one" , "Sort of turnip - one from Scandinavia?" , "Scandinavian; root veg." , "Root vegetable - European" .)