Exchange New Orleans jazz style with German one (5-2)
I believe the answer is:
trade-in
'exchange new orleans jazz' is the definition.
'trade in' can be an answer for 'exchange' (trading in is a kind of exchanging). I'm not sure about the 'new orleans jazz' bit.
'style with german one' is the wordplay.
'style' becomes 'trad' (I have seen 'Style of jazz' mean 'trad' so perhaps 'style' could also mean 'trad').
'with' is a charade indicator (letters next to each other).
'german one' becomes 'ein' (I've seen this in another clue).
'trad'+'ein'='TRADE-IN'
Can you help me to learn more?
(Other definitions for trade-in that I've seen before include "Trained (anag.)" , "Older article used in part payment to retailer" , "Old item given in part payment for a new one" , "Article used in part-exchange" , "Article used in part payment for another" .)