Do get involved in some game (8)
I believe the answer is:
dominoes
'game' is the definition.
(dominoes is a kind of game)
'do get involved in some' is the wordplay.
'get' means one lot of letters go next to another.
'involved' indicates an anagram (involved can mean confusing or complex).
'in'+'some'='insome'
'insome' is an anagram of 'minoes'.
'do'+'minoes'='DOMINOES'
(Other definitions for dominoes that I've seen before include "Traditional pub game" , "Table-top game" , "Game with twenty-eight pieces" , "masks" , "Game played with black pieces with white spots" .)