Is obliged to wind up the party in a hurry (5)
I believe the answer is:
hasty
'party in a hurry' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
'is obliged to wind up' is the wordplay.
'is obliged' becomes 'has'.
'to wind up' becomes 'ty' (I can't justify this - if you can you should give a lot more credence to this answer).
'has'+'ty'='HASTY'
'the' acts as a link.
Can you help me to learn more?
(Other definitions for hasty that I've seen before include "Precipitate" , "Rash; thoughtless" , "Hurried; without thinking" , "Impulsive" , "Precipitous" .)