Study clothes to change the point of delivery (9)
I believe the answer is:
readdress
'change the point of delivery' is the definition.
I can't judge whether this defines the answer.
'study clothes' is the wordplay.
'study' becomes 'read' ('read' can be a synonym of 'study').
'clothes' becomes 'dress' (dress is a kind of clothes**).
'read'+'dress'='READDRESS'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for readdress that I've seen before include "forward" , "tackle again" , "Have another look at" , "change direction" .)