Finished a number of deliveries (4)
I believe the answer is:
over
This clue might be a double definition.
'finished a number' is the first definition.
'over' can be an answer for 'finished' (I've seen this before). I am not sure about the 'a number' bit.
'deliveries' is the second definition.
(I've seen this in other clues)
'of' is the link.
Can you help me to learn more?
(Other definitions for over that I've seen before include "Finished like bowling session" , "Finished - across - in excess" , "settled" , "Exceeding - finished" , "balls > left" .)