Under compulsion, Home Office initially agreed (6)
I believe the answer is:
hooked
'agreed' is the definition.
Both the definition and answer are adjectives. Maybe you can see a link between them that I don't see?
'under compulsion home office initially' is the wordplay.
'under compulsion' becomes 'oked' (I can't justify this - if you can you should believe this answer much more).
'home office' becomes 'HO' (abbreviation).
'initially' is a charade indicator (letters next to each other) (some letters go before others).
'oked' put after 'ho' is 'HOOKED'.
Can you help me to learn more?
(Other definitions for hooked that I've seen before include "Addicted or curved down" , "Enthralled" , "Curved down, like an eagle's beak" , "Addicted; (fish) caught" , "Unable to come off drugs" .)