Happiness interrupted by supervisor that's cut short loud game (6,2,3)
I believe the answer is:
chemin de fer
'game' is the definition.
(chemin de fer is a kind of game)
'happiness interrupted by supervisor that's cut short loud' is the wordplay.
'happiness' becomes 'cheer'.
'interrupted by' means one lot of letters goes inside another.
'supervisor' becomes 'minder'.
'that's cut short' means to remove the last letter.
'loud' becomes 'f' (A musical term).
'minder' with its last letter taken off is 'minde'.
'minde'+'f'='mindef'
'cheer' going around 'mindef' is 'CHEMIN-DE-FER'.
(Other definitions for chemin de fer that I've seen before include "proceeding along French lines" , "Card game, gambling against the banker" , "French railway" , "Game like baccarat" , "Variant of baccarat" .)