Clear everyone is following introduction to board game (7)
I believe the answer is:
netball
'game' is the definition.
(netball is a sport)
'clear everyone is following introduction to board' is the wordplay.
'clear' becomes 'net' (as in net profit).
'everyone' becomes 'all' (all people).
'is following' says to put letters next to each other.
'introduction to' suggests taking the first letters.
The first letter of 'board' is 'b'.
'all' after 'b' is 'ball'.
'net'+'ball'='NETBALL'
(Other definitions for netball that I've seen before include "Women's game" , "After this, you get to serve again" , "Team sport" , "Game for women or girls" , "Team game/sport" .)