Label a game (3)
I believe the answer is:
tag
This clue is a double definition.
'label' is the first definition.
(I know that label can be written as tag)
'a game' is the second definition.
(children's playground game)
(Other definitions for tag that I've seen before include "Tab" , "Name" , "Children's chasing game" , "Restriction" , "Identity badge" .)