After sales talk, study's done up with decorations (9)
I believe the answer is:
patterned
'study's done up with decorations' is the definition.
I can't judge whether this definition defines the answer.
'after sales talk' is the wordplay.
I cannot really understand how this works, but
'talk' could be 'patter' (I have seen 'Rapid talk ' mean 'patter' so perhaps 'talk' could also mean 'patter') and 'patter' is found within the answer.
The remaining letters 'ned' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for patterned that I've seen before include "featuring decorative designs" , "Tender tap (anag.)" , "may be checked" .)