Charge to import last of grape harvest (4)
I believe the answer is:
reap
'harvest' is the definition.
(I know that harvest can be written as reap)
'charge to import last of grape' is the wordplay.
'charge' becomes 'rap' (I've seen this in another clue).
'to import' means one lot of letters goes inside another.
'last of' says to take the final letters.
The final letter of 'grape' is 'e'.
'rap' enclosing 'e' is 'REAP'.
(Other definitions for reap that I've seen before include "Get -- derive" , "Cut the corn" , "Harvest, garner" , "Gather 23dn" , "'As you sow, so shall you . . . .'" .)