Clue 79 An indirect approach is necessary for the raw cadet. (7)
An indirect approach .... so, in this game you have got into a position whereby you cannot aim at the target ball directly, maybe you have to swerve or come off a cushion.
Having got the word for this game .... look the word up at
http://www.answers.com/ scroll down to the section on History and read ..... this will tell you about a belief concerning the origins of the game in India in 1875, and will answer the -raw cadet- part of the question for you.