World leaders that shout and argue have become sour (6)
I believe the answer is:
saturn
'world leaders that shout' is the definition.
'Saturn' can be an answer for 'world' (Saturn is another planet). I am unsure of the rest of the definition.
'argue have become sour' is the wordplay.
'argue have' becomes 'sa' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'become sour' becomes 'turn' (I've seen this in another clue).
'sa'+'turn'='SATURN'
'and' is the link.
Can you help me to learn more?
(Other definitions for saturn that I've seen before include "The second largest planet" , "Turn as a planet" , "Giant planet" , "tried to pass vessel" , "Roman god - gas giant" .)