End on the back of chair, awkwardly seated in ceremony (9)
I believe the answer is:
enthroned
'seated in ceremony' is the definition.
The answer and definition can be both to do with social activities as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?
'end on the back of chair awkwardly' is the wordplay.
'back of' says to take the final letters.
'awkwardly' indicates anagramming the letters.
The final letter of 'chair' is 'r'.
'end'+'on'+'the'+'r'='endonther'
'endonther' is an anagram of 'ENTHRONED'.
Can you help me to learn more?
(Other definitions for enthroned that I've seen before include "Put in place" , "Honourably placed" , "Made bishop" , "Installed (as monarch)" .)