Scotland's odd about case for players (9)
I believe the answer is:
orchestra
'players' is the definition.
(group playing music)
'scotland's odd about case' is the wordplay.
'scotland's odd' becomes 'orra' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' indicates putting letters inside.
'case' becomes 'chest' (both are types of container).
'orra' going around 'chest' is 'ORCHESTRA'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for orchestra that I've seen before include "many players" , "Big band" , "Brass, woodwind, strings and percussion" , "Noted performers" , "A number of musicians" .)