Group in the latest uprising (3)
I believe the answer is:
set
'group' is the definition.
(set is a kind of group)
'in the latest uprising' is the wordplay.
'in' says the answer is hidden in the clue.
'uprising' shows that the letters should be reversed in order.
'tes' is hidden in the letters of 'latest'.
'tes' back-to-front is 'SET'.
(Other definitions for set that I've seen before include "Put down tennis games" , "Fix; lay" , "decline" , "Become solid like jelly" , "plant" .)