Chocolate filling (7)
I believe the answer is:
praline
'chocolate filling' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for praline that I've seen before include "Sweet made with butter and pecans" , "Substance made of nuts boiled in sugar, used to fill chocolates" , "Sweet stuff" , "French confection" , "Confection made with crushed nuts" .)