Lame activity (4)
I believe the answer is:
game
I believe this is a double definition.
'lame' is the first definition.
('game' can describe a permanently injured leg)
'activity' is the second definition.
(game is a kind of activity)
(Other definitions for game that I've seen before include "Somehow disabled" , "See 3" , "computer pastime?" , "Birds hunted for food" , "Lark" .)