On a happy note’s re-packing the bag (9)
I believe the answer is:
gladstone
'bag' is the definition.
(I know that Gladstone is a type of bag)
'on a happy note's re-packing the' is the wordplay.
'on' is a charade indicator (letters next to each other).
'a' becomes 'one'.
'happy note's re' becomes 'glads' (I can't justify this - if you can you should give a lot more credence to this answer).
'packing' indicates putting letters inside (some letters are packed inside).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'one' after 'glads' is 'gladsone'.
'gladsone' going around 't' is 'GLADSTONE'.
Can you help me to learn more?
(Other definitions for gladstone that I've seen before include "PM no longer" , "Old English P.M. or a doctor's bag" , "Victorian GOM" , "5,27 [PRIME MINISTER]" , "C. nineteenth Liberal prime minister" .)