Game with boxes, present finally emerging (5)
I believe the answer is:
chess
'game' is the definition.
(chess game is a kind of game)
I don't understand the remainder of the clue.
(Other definitions for chess that I've seen before include "show" , "Musical - board game" , "In which two bishops will participate" , "Board game for two players" , "that has over thirty men on board" .)