Those in newspapers taking one of the joints in charge of The Party (10)
I believe the answer is:
leadership
'newspapers taking one of the joints in charge of the party' is the definition.
I can't judge whether this definition defines the answer.
'those in' is the wordplay.
'those' becomes 'leaders' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' becomes 'hip' (both can mean fashionable).
'leaders'+'hip'='LEADERSHIP'
Can you help me to learn more?
(Other definitions for leadership that I've seen before include "Commander's attribute" , "Those in charge" , "What editor gives" , "Had replies (anag.)" , "Best party people" .)