Nothing disturbs even throwing game (6)
I believe the answer is:
quoits
'throwing game' is the definition.
(game in which rings are thrown)
'nothing disturbs even' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'disturbs' is an insertion indicator (inserted letters interrupt or disturb the word).
'even' becomes 'quits' (as in 'call it quits').
'o' inserted inside 'quits' is 'QUOITS'.
(Other definitions for quoits that I've seen before include "Game with rings, played on deck perhaps" , "Rings-over-post game" , "Game with rings, played on board ship, perhaps" , "Game using rubber rings" .)