Mob intend uprising about a fine (5)
I believe the answer is:
mafia
'mob' is the definition.
(Mafia is an example)
'intend uprising about a fine' is the wordplay.
'intend' becomes 'aim' (aiming is a kind of intending).
'uprising' is a reversal indicator.
'about' means one lot of letters goes inside another.
'fine' becomes 'f' (abbreviation).
'aim' reversed gives 'mia'.
'a'+'f'='af'
'mia' enclosing 'af' is 'MAFIA'.
(Other definitions for mafia that I've seen before include "Gangsters" , "Sicilian criminal body" , "Criminal organisation also known as Cosa Nostra" , "connection claimed to 23 [JFK]" , "Secret criminal organisation" .)