Parting word puts odds even in organised choir (7)
I believe the answer is:
cheerio
'parting word' is the definition.
(cheerio means goodbye)
'odds even in organised choir' is the wordplay.
'odds even' becomes 'ee' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'organised' indicates an anagram.
'choir' is an anagram of 'chrio'.
'ee' put inside 'chrio' is 'CHEERIO'.
'puts' acts as a link.
Can you help me to learn more?
(Other definitions for cheerio that I've seen before include "Final message" , "An informal hearty goodbye" , "Say this before drinking" , "A hearty farewell, begins with applause" , "Bye" .)