Game lady, not half, scores freely (8)
I believe the answer is:
lacrosse
'game' is the definition.
(lacrosse is a kind of game)
'lady not half scores freely' is the wordplay.
'not half' means to take half the letters.
'freely' indicates anagramming the letters.
'lady' cut in half is 'la'.
'scores' with letters rearranged gives 'crosse'.
'la'+'crosse'='LACROSSE'
(Other definitions for lacrosse that I've seen before include "Game played with netted sticks" , "Sport played with sticks" , "Score's uncertain after the Spanish" , "Game played with a netted stick" , "Ball game using netted stick" .)