Odd in Scotland, keeping box for players (9)
I believe the answer is:
orchestra
'for players' is the definition.
(group playing music)
'odd in scotland keeping box' is the wordplay.
'odd in scotland' becomes 'orra' (I've seen this in another clue).
'keeping' is an insertion indicator (some letters kept inside).
'box' becomes 'chest' (chest is a kind of box).
'orra' enclosing 'chest' is 'ORCHESTRA'.
(Other definitions for orchestra that I've seen before include "Ensemble of players" , "Large musical group" , "alternative to the organ" , "in four sections" , "Musicians, maybe in theatre" .)