Label the game (3)
I believe the answer is:
tag
I believe this is a double definition.
'label' is the first definition.
(I know that label can be written as tag)
'game' is the second definition.
(children's playground game)
'the' acts as a link.
(Other definitions for tag that I've seen before include "Children's chasing game" , "Restriction" , "Refrain" , "day in Berlin" , "Identity disc" .)