Be all wrong about the spectators admitted for the game (9)
I believe the answer is:
bagatelle
'game' is the definition.
(I know that bagatelle is a type of table game)
'be all wrong about the spectators admitted' is the wordplay.
'wrong' indicates anagramming the letters.
'about' means one lot of letters goes inside another.
'the spectators admitted' becomes 'gate' (number of people admitted to a sports ground).
'be'+'all'='beall'
'beall' is an anagram of 'balle'.
'balle' placed around 'gate' is 'BAGATELLE'.
'for the' is the link.
(Other definitions for bagatelle that I've seen before include "Game; piece of music" , "Trifle; pinball game" , "game at the tables?" , "Trivial matter" , "musical composition" .)