Late series of deliveries appropriate (7)
I believe the answer is:
overdue
'late' is the definition.
(similar in meaning)
'deliveries appropriate' is the wordplay.
'deliveries' becomes 'over' (I've seen this before).
'appropriate' becomes 'due' (similar in meaning).
'over'+'due'='OVERDUE'
'series of' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for overdue that I've seen before include "Behind schedule" , "Not paid by the agreed time, late" , "Past the expected time of arrival" , "Still unpaid" , "Late arriving" .)