Some aggro under stand for game (8)
I believe the answer is:
rounders
'for game' is the definition.
(rounders is a kind of game)
'some aggro under stand' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ROUNDERS' is hidden within 'aggro under stand'.
(Other definitions for rounders that I've seen before include "Game like baseball" , "Game resembling baseball" , "Local form of American baseball" , "Game played with bat and ball" , "Game similar to baseball" .)