Fellow king sure to be stuck in an office (9)
I believe the answer is:
deskbound
'fellow' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?
'king sure to be stuck in an office' is the wordplay.
'king' becomes 'K' (abbreviation for king in chess).
'sure' becomes 'bound' (synonyms).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'be stuck in an office' becomes 'des' (I can't explain this - if you can you should believe this answer much more).
'k'+'bound'='kbound'
'kbound' after 'des' is 'DESKBOUND'.
Can you help me to learn more?
(Another definition for deskbound that I've seen is " Tied to sedentary work".)