Son in practice session raised game (6)

I believe the answer is:
tennis
'game' is the definition.
(tennis is a game)
'son in practice session raised' is the wordplay.
'son' becomes 's' (genealogical abbreviation for son).
'practice session' becomes 'net' (I can't justify this - if you can you should believe this answer much more).
'raised' says the letters should be written in reverse (going up in a down clue).
's'+'in'+'net'='sinnet'
'sinnet' backwards is 'TENNIS'.
Can you help me to learn more?
(Other definitions for tennis that I've seen before include "Racket-and-ball game" , "Roger Federer's game - anyone for it?" , "Popular racquet game - anyone for it?" , "Racquet sport" , "Sport with grand slams?" .)
