I appreciate that golf game (3)
I believe the answer is:
tag
'game' is the definition.
(children's playground game)
'i appreciate that golf' is the wordplay.
'i appreciate that' becomes 'ta' (informal way of saying thank you).
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'ta'+'g'='TAG'
(Other definitions for tag that I've seen before include "Label - children's game" , "Identity disc" , "dog" , "Small label" , "Label (to attach)" .)