Put in the order agreed upon? (8)
I believe the answer is:
arranged
'put in' is the definition.
Both the definition and answer are adjectives. Maybe they are linked in a way I don't understand?
'order agreed upon?' is the wordplay.
'order' becomes 'arrange' (synonyms).
'agreed upon?' becomes 'd' (I can't justify this - if you can you should give a lot more credence to this answer).
'arrange'+'d'='ARRANGED'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for arranged that I've seen before include "Fixed" , "Settled plans for something" , "Organised, planned" , "Ordered" , "Put in order or adapted a piece of music" .)