Some chocolates or toffees? Not exactly (4,2)
I believe the answer is:
sort of
'not exactly' is the definition.
(I've seen this before)
'some chocolates or toffees?' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'SORT-OF' is hidden within 'chocolates or toffees'.
(Other definitions for sort of that I've seen before include "To some (great or small) extent" , "Not quite, but almost" , "Somewhat" , "Not exactly" , "Possibly, to an extent" .)