Label that may be applied to a children's game (3)
I believe the answer is:
tag
I believe this is a double definition.
'label that may be applied' is the first definition.
'a children's game' is the second definition.
(I've seen this before)
'to' acts as a link.
(Other definitions for tag that I've seen before include "Label - children's game" , "Refrain" , "Name" , "Restriction" , "Tab" .)