Exchange ending finally with malign chants? (8,5)
I believe the answer is:
slanging match
'exchange ending finally with malign chants?' is the definition.
'exchange ending finally with malign chants?' is the wordplay.
'exchange' indicates anagramming the letters.
'finally' says to take the final letters.
'with' means one lot of letters go next to another.
The final letter of 'ending' is 'g'.
'g'+'malign'+'chants'='gmalignchants'
'gmalignchants' anagrammed gives 'SLANGING MATCH'.
(Other definitions for slanging match that I've seen before include "Heated exchange of abuse" , "Violent argument" , "Row" , "altercation" , "Stormy exchange" .)