Group, dynastic, needing reform, obsolete ultimately (9)
I believe the answer is:
syndicate
'group' is the definition.
(syndicate is a kind of group)
'dynastic needing reform obsolete ultimately' is the wordplay.
'needing reform' indicates an anagram.
'ultimately' indicates one should take the final letters.
The final letter of 'obsolete' is 'e'.
'dynastic' is an anagram of 'syndicat'.
'syndicat'+'e'='SYNDICATE'
(Other definitions for syndicate that I've seen before include "Group of promoters with a common interest" , "Nay, edicts changed for the business association" , "Association of people or firms for business purposes" , "Team" , "Affiliated group" .)