Remaining deliveries done (4)
I believe the answer is:
over
This clue is a triple definition!
'remaining' is the first definition.
(as in 'we ate them all but had one over')
'deliveries' is the second definition.
(I've seen this in other clues)
'done' is the third definition.
(I've seen this in other clues)
(Other definitions for over that I've seen before include "Ancient history" , "See 12" , "bowling unit" , "Work out of hours" , "Finished - across - in excess" .)