Rio as far as we're concerned ungovernable (7)
I believe the answer is:
riotous
'concerned ungovernable' is the definition.
I can't judge whether this defines the answer.
'rio as far as we're' is the wordplay.
'as far as' becomes 'to'.
'we're' becomes 'us' (I am not sure about this - if you are sure you should believe this answer much more).
'rio'+'to'+'us'='RIOTOUS'
Can you help me to learn more?
(Other definitions for riotous that I've seen before include "Of mob, disorderly and unruly" , "Wild, uncontrolled" , "Unrestrained, wild living perhaps" , "Hilariously funny" , "Anarchic" .)