Exchange without one outburst (6)
I believe the answer is:
tirade
'outburst' is the definition.
(I've seen this before)
'exchange without one' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'exchange' could be 'trade' (trading is a kind of exchanging) and 'trade' is located in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for tirade that I've seen before include "Flow of invective" , "Long angry harangue" , "Inclination; fish" , "A long abusive harangue" , "Stream of invective" .)