Harangues one involved in deals (7)
I believe the answer is:
tirades
'harangues' is the definition.
(I've seen this in another clue)
'one involved in deals' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'deals' could be 'trades' ('trade' can be a synonym of 'deal') and 'trades' is present 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 tirades that I've seen before include "Speeches of violent denunciation" , "Invective" , "Abusive words" , "Rants" , "Long angry speeches of criticism or accusation" .)