Not yet chosen? Large kid going outside for game (8)
I believe the answer is:
football
'not yet chosen? large kid going' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'outside for game' is the wordplay.
'outside for' becomes 'foot' (I can't explain this - if you can you should believe this answer much more).
'game' becomes 'ball game' (ball game is a kind of game).
'foot'+'ball'='FOOTBALL'
Can you help me to learn more?
(Other definitions for football that I've seen before include "Liverpool or Everton, for example" , "Ball game" , "Strange ballot of the game" , "Gambling on soccer results" , "The beautiful game, some say" .)