Duel as result of rant or challenges like this, with second intervening (5,6)
I believe the answer is:
cross swords
'duel as result of rant or challenges' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'this with second intervening' is the wordplay.
'this' becomes 'crossword' (the crossword currently being solved is an example).
'with' is an insertion indicator.
'second' becomes 's' (common abbreviation).
'intervening' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'crossword' going around 's' is 'crosssword'.
'crosssword'+'s'='CROSS SWORDS'
'like' acts as a link.
Can you help me to learn more?
(Other definitions for cross swords that I've seen before include "Have a disagreement" , "fight" , "Get into a dispute" , "quarrel" , "start the duelling" .)